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English: Tourists gather around one of the generators in the Nevada wing of the powerhouse of Boulder Dam (later Hoover Dam) to hear its operation explained.
Date 28 September 1940
Author Bureau of Reclamation photographer
Public domain This article or image contains material based on a work of a Bureau of Reclamation employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain.
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