The 33 convicted members of the Duquesne spy ring
Photograph shows thirty-three "mug shot" portraits of the Dusquesne spy ring; Duquesne is in the first row, far right. On verso: FBI print. Forms part of: New York World-Telegram and the Sun Newspaper Photograp... More
U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, ...
See also HAER PA-115 for additional documentation. Includes written data (pages 227 through 238). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, ...
See also HAER PA-115 for additional documentation. Includes written data (pages 227 through 238). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Electric Furnace Steelmaking Plant, Along M...
Picryl description: Public domain photo of a factory, warehouse, commercial or industrial building, free to use, no copyright restrictions image.
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
Duquesne, Allegheny County, Pennsylvania 1897.
Perspective map not drawn to scale. Bird's-eye-view. LC Panoramic maps (2nd ed.), 766 Available also through the Library of Congress Web site as a raster image. Indexed for points of interest. AACR2
U.S. Steel Duquesne Works, West bank of Monongahela River along State ...
Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integrated steel producing ventures in the Monongahela Valley of western Pennsylvania. Constructed af... More
U.S. Steel Duquesne Works, Primary Mill, Along Monongahela River, Duqu...
See also HAER PA-115 for additional documentation. Includes written data (pages 211 through 226). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, ...
See also HAER PA-115 for additional documentation. Includes written data (pages 227 through 238). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Auxiliary Buildings & Shops, Along Monongah...
Picryl description: Public domain photo of a factory, warehouse, commercial or industrial building, free to use, no copyright restrictions image.
U.S. Steel Duquesne Works, Auxiliary Buildings & Shops, Along Monongah...
Public domain photograph of a shop, shopping, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
Carnegie Steel Co., Duquesne Plant, Duquesne, Pennsylvania
Public domain photograph - panorama, United States, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
![[Duquesne Incline, Pittsburgh, Pennsylvania]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MDAvMDEvMDEvZHVxdWVzbmUtaW5jbGluZS1waXR0c2J1cmdoLXBhLTEwMjQuanBn/40/32/webp "[Duquesne Incline, Pittsburgh, Pennsylvania]")
[Duquesne Incline, Pittsburgh, Pennsylvania]
Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description
U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, ...
See also HAER PA-115 for additional documentation. Includes written data (pages 227 through 238). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, ...
See also HAER PA-115 for additional documentation. Includes written data (pages 227 through 238). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Heat Treatment Plant, Along Monongahela Riv...
See also HAER PA-115 for additional documentation. Includes written data (pages 182 through 189). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Heat Treatment Plant, Along Monongahela Riv...
See also HAER PA-115 for additional documentation. Includes written data (pages 182 through 189). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Auxiliary Buildings & Shops, Along Monongah...
Picryl description: Public domain image of an industrial building, warehouse, depot, train station, 19th-20th century, free to use, no copyright restrictions.
U.S. Steel Duquesne Works, Auxiliary Buildings & Shops, Along Monongah...
Picryl description: Public domain photo of a factory, warehouse, commercial or industrial building, free to use, no copyright restrictions image.
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
Charles E. Hughes speaking during campaign, Duquesne, Pa., 1916 /
Presidential candidate Charles Evans Hughes campaigns in Pittsburgh vicinity on Sept. 27, 1916. Hughes was on a strenuous tour in an attempt to knit together various Republican factions. In Pittsburgh area he w... More
U.S. Steel Duquesne Works, West bank of Monongahela River along State ...
Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integrated steel producing ventures in the Monongahela Valley of western Pennsylvania. Constructed af... More
U.S. Steel Duquesne Works, Auxiliary Buildings & Shops, Along Monongah...
Public domain photograph of a shop, shopping, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Electric Furnace Steelmaking Plant, Along M...
Public domain photograph of electric equipment, power generation, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, ...
See also HAER PA-115 for additional documentation. Includes written data (pages 227 through 238). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Auxiliary Buildings & Shops, Along Monongah...
Public domain photograph of a shop, shopping, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Electric Furnace Steelmaking Plant, Along M...
Public domain photograph of electric power plant, generation, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
Duquesne Steel Plant, Carnegie Steel Co., Duquesne, Pennsylvania
Picryl description: Public domain image related to an industrial revolution, industry history, factory building, free to use, no copyright restrictions image.
U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, ...
See also HAER PA-115 for additional documentation. Includes written data (pages 227 through 238). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Heat Treatment Plant, Along Monongahela Riv...
See also HAER PA-115 for additional documentation. Includes written data (pages 182 through 189). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
McClure Avenue Well, McClure Avenue at Monongahela River, Duquesne, Al...
Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; HAER PA-299, Monongahela Lock and Dam No. 7; and HAE... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Fuel & Utilities Plant, Along Monongahela R...
See also HAER PA-115 for additional documentation. Includes written data (pages 239 through 248). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
Duquesne, Allegheny County Pennsylvania, 1897
38010 U.S. Copyright Office. This record contains unverified data from PGA shelflist card. Associated name on shelflist card: Fowler, T.M.
Hoover & Duquesne Univ. of Pittsburgh football team, 11/8/29
A group of men standing in front of a white house. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, West bank of Monongahela River along State ...
Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integrated steel producing ventures in the Monongahela Valley of western Pennsylvania. Constructed af... More
U.S. Steel Duquesne Works, Primary Mill, Along Monongahela River, Duqu...
See also HAER PA-115 for additional documentation. Includes written data (pages 211 through 226). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Auxiliary Buildings & Shops, Along Monongah...
Public domain photograph of a shop, shopping, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Electric Furnace Steelmaking Plant, Along M...
Public domain photo of a monument, historic place, free to use, no copyright restrictions image - Picryl description
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Basic Oxygen Steelmaking Plant, Along Monon...
See also HAER PA-115 for additional documentation. Includes written data (pages 190 through 210). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward inte... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More
U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela Rive...
See also HAER PA-115 for additional documentation. Includes written data (pages 55 through 158). Significance: The construction of the Duquesne Steel Works marked an important event in the movement toward integ... More