Search for all of "Black Canyon", all of "Hoover Dam ariz And Nev -- Design And Construction"

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151. Road tunnel portal	152. View from the top of Hoover Dam of construction on the power houses	153. Hoover Dam construction site, looking upstream from the lower portals road
154. Construction on Hoover Dam and the power houses looking upstream from the lower portals road	155. Construction on the power houses and valve houses viewed from the top of Hoover Dam