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Placer Mines--The Boulder Range, Knapp's Ranch, Columbia, Tuolumne County

Hydraulic mining - the big boulder, Kentucky Claim, Timbuctoo, Yuba County

Placer Mining in the Boulder range, Columbia, Tuolumne County

Mr. H.E. Eder and family at Bowlder [i.e. Boulder] Rock

Boulder, Colorado

Bartlett Boulder, Upper Bartlett, White Mountains

Boulder bend, Saranac Lake [i.e. River], Adirondack Mts., N.Y.

[Men seated on rocks overlooking Catskill Mountains: boulder on South Mountain]

Boulder Rock and Hotel Kaaterskill, Catskill Mountains, N.Y.

Hotel Kaaterskill from Boulder Rock, Catskill Mountains, N.Y.

Unveiling and dedication of Lincoln-Douglas Boulder by President Roosevelt at Freeport, Ills. June 3, 1903

Unveiling and dedication of Lincoln-Douglas Boulder by President Roosevelt at Freeport, Ills. June 3, 1903

Boulder Dam, air shot

[Saranac Lake, boulder bend, Saranac River, Adirondacks, N.Y.]

Boulder, Colo. Disaster of Aug. 10, 1907

[Boulder, Colorado]

Ivy Baldwin breaking the record for tight-rope walking-rope 580 feet high and 555 feet long, near Boulder, Colo

Bounded by fertile plains and snow capped mountains, Boulder, Colorado

Highest and longest tight-rope walk on record, 580 feet high and 555 feet long - by Ivy Baldwin, near Boulder, Colo

Boulder bend, Saranac River, Adirondack Mts., N.Y.

Tree-shaded Boulder and the curious Flatirons S. from Lovers Hill, Colo

Royal Arch, Flat Iron Mts., near Boulder, Colo

May Day Fete, 1914, University of Colorado

Rocky Mt. Nat. Park, [Colorado]; boulder on trail

Toy sale window, Boulder, Col. Kathrine L. Chace

Construction of the Haifa harbour. The Athlit quarries. Crane raising huge boulder

Boulder Dam Commission

Boulder Dam, (i.e. Hoover Dam) between Arizona and Nevada. Placing concrete in the sidewall of the Nevada spillway. A 2 cubic yard bottom-dump bucket is being handled by crane. Note the manner in which the panels are staggered

Boulder Dam. Nevada

Boulder [i.e., Hoover] Dam, Colo. [i.e., Arizona and Nevada]

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Washington, D.C. Two girls sitting on a large boulder on the bank of Rock Creek writing letters

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. A mass of transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Las Vegas, Nevada. Transmission towers and transformers redistributing power from Boulder Dam to Basic Magnesium Incorporated, which produces huge quantities of the lightest of all metals for aircraft and other wartime manufacturing

Sequoia National Park, Sept. 1957. Giant redwood tree poised on mammoth boulder

Aerial view of Hoover Dam near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada, with the Lake Mead National Recreation Area, which the dam's blocking of the Colorado created, in the distance

Aerial views of Lake Mead National Recreation Area, formed when Hoover Dam backed up the Colorado River. Boulder City, Nevada

Above Hoover Dam near Boulder City, Nevada

Lake Mead National Recreation Area, formed when Boulder Dam (now Hoover Dam) was built, Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Locals painted a boulder to welcome Appalachian Trail hikers and other visitors to Baxter State Park in Maine. It lies at the foot of Mount Katahdin, which is the northern terminus of the great footpath that winds its way all the way to Georgia

Lake Mead National Recreation Area, Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial views of Lake Mead National Recreation Area, formed when Hoover Dam backed up the Colorado River. Boulder City, Nevada

Lake Mead National Recreation Area, formed by the creation of Hoover Dam, near Boulder City, Nevada

Lake Mead National Recreation Area, created by the building of Boulder (later Hoover) Dam, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Aerial view of Hoover Dam near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Lake Mead National Recreation Area, formed when Boulder Dam (now Hoover Dam) was built, Boulder City, Nevada

Lake Mead National Recreation Area, formed when Boulder Dam (now Hoover Dam) was built, Boulder City, Nevada

Aerial view of Hoover Dam near Boulder City, Nevada

Aerial view of Hoover Dam, near Boulder City, Nevada

Boulder inscribed with the words "Jesus Saves"

Aerial view of Boulder Dam with Lake Mead in the background Image. Boulder City, Nevada

Boulder Bridge, Rock Creek Park, NW, Washington, D.C.

Boulder Bridge, Rock Creek Park, NW, Washington, D.C.

Boulder Bridge, Rock Creek Park, NW, Washington, D.C.

Boulder Bridge, Rock Creek Park, NW, Washington, D.C.

[Boulder Beach in Stonington, Connecticut]

[Boulder Beach in Stonington, Connecticut]

[Boulder Beach in Stonington, Connecticut]

[Boulder Beach in Stonington, Connecticut]

Boulder Beach in [Stonington], Connecticut

Boulder Beach in [Stonington], Connecticut

[Boulder Beach in Stonington, Connecticut]

Boulder Beach in [Stonington], Connecticut

Boulder Beach in [Stonington], Connecticut

[Boulder Beach in Stonington, Connecticut]

Boulder Beach in [Stonington], Connecticut

Boulder Beach in [Stonington], Connecticut

High-country views in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

View of the timberline from the old, one-way, dirt Fall River Road in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

Riders on horseback cross a lush meadow in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

Continental Divide sign high in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

Lake Irene in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

A raging stream in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

High-country views in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

Mountain stream along the old, one-way, dirt Fall River Road in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

High-country views in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

A raging stream in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

Majestic view from the old, one-way, dirt Fall River Road in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado

Majestic view from the old, one-way, dirt Fall River Road in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado