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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. Sourced from the Library of Congress.

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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. Sourced from the Library of Congress.

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