Boulder dam Between Arizona and Nevada May 1933 Drillers at work on the bench on the Nevada side excavating the dam foundation

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Photo credit: © Folio / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 1933, 117351, 293499, america, arizona, boulder, building, construction, dam, drillers, drilling, engineering, excavating, excavation, foundation, historic, history, lc, nevada, states, tif, united, usa, usz62, workers