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Boulder Dam, between Arizona and Nevada, Apr. 1938. Power plant discharge from two 84-inch needle valves as seen from the high mountain downstream from the dam. Fortification mountain is in the background. Sourced from the Library of Congress.

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Boulder Dam, between Arizona and Nevada, Apr. 1938. Power plant discharge from two 84-inch needle valves as seen from the high mountain downstream from the dam. Fortification mountain is in the background. Sourced from the Library of Congress.

More