Picryl description: Public domain image of a worker, labor, factory, plant, manufacture, industrial facility, 1930s, mid-20th-century industrial photo, free to use, no copyright restrictions.
Picryl description: Public domain image of an aircraft, assembly line, industrial facility, 1930s aviation, free to use, no copyright restrictions.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of an aircraft, assembly line, industrial facility, 1930s aviation, free to use, no copyright restrictions.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of a worker, labor, factory, plant, manufacture, industrial facility, 1930s, mid-20th-century industrial photo, free to use, no copyright restrictions.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of a worker, labor, factory, plant, manufacture, industrial facility, 1930s, mid-20th-century industrial photo, free to use, no copyright restrictions.
Public domain photograph of 1930s industry, war production in the United States free to use, no copyright restrictions image - Picryl description
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of an aircraft, assembly line, industrial facility, 1930s aviation, free to use, no copyright restrictions.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Public domain photograph of 1930s industry, war production in the United States free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image related to politics, political campaigns, committee, free to use, no copyright restrictions.
Picryl description: Public domain historical photo of Washington DC during the First World War, free to use, no copyright restrictions image.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of an industrial building, factory, workshop, workers, 20th century, free to use, no copyright restrictions.
Public domain photograph of 1930s industry, war production in the United States free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain historical photo of Second World War, free to use, no copyright restrictions image.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of a worker, labor, factory, plant, manufacture, industrial facility, 1930s, mid-20th-century industrial photo, free to use, no copyright restrictions.
Picryl description: Public domain historical photo of Washington DC during the First World War, free to use, no copyright restrictions image.
Picryl description: Public domain image of a factory, plant, manufacture, assembly line, industrial facility, early 20th-century industrial architecture, free to use, no copyright restrictions.
Picryl description: Public domain image related to politics, political campaigns, committee, free to use, no copyright restrictions.
Picryl description: Public domain historical photo of Washington DC during the First World War, free to use, no copyright restrictions image.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of an aircraft, assembly line, industrial facility, 1930s aviation, free to use, no copyright restrictions.
Picryl description: Public domain image of an arch stone structure, bridge, or tunnel, free to use, no copyright restrictions.
Picryl description: Public domain image related to politics, political campaigns, committee, free to use, no copyright restrictions.
Public domain photograph of 1930s-1940s train station, train car, no copyright restrictions image - Picryl description
Public domain photograph related to Great Depression, free to use, no copyright restrictions image - Picryl description
Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description
Picryl description: Public domain image of a classroom, college auditorium, school, students, teacher, teaching, studying, education, free to use, no copyright restrictions.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Picryl description: Public domain image of workers, labor, 1940s, economic conditions, free to use, no copyright restrictions.
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More
Significance: Hailed as "America's Longest Concrete-Arch Bridge" when it opened in 1932, the bridge's main span remains one of the longest concrete arch spans in the U.S. This structure represents the highest e More