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Black and white image of President Herbert Hoover and official party during an inspection tour of the Boulder Canyon Project. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of the group of men who witnessed the pouring of the first concrete in Hoover Dam proper. From left to right: H. J. Lawler, Director of Six Companies, Inc.; Walker R. Young, Construction Engineer, U.S. Bureau of Reclamation; Frank T. Crowe, General Superintendent, Six Companies, Inc.; C. A. Shea, Director of Construction, Six Companies, Inc. W. A. Bechtel, President, Six Companies, Inc.; R. F. Walter, Chief Engineer, U.S. Bureau of Reclamation; Theodore A. Walters, First Assistant Secretary of the Interior ; Ed Clark & C. P. Squires, members of the original Colorado River Commission. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "Upstream face of the dam as seen from portal of construction tunnel on Nevada side of Black Canyon." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of the gravel testing laboratory at the site of the former Stewart Ranch, also known as the Las Vegas Ranch. O. G. Patch stands in the foreground. Site Name: Las Vegas Ranch (Las Vegas, Nev.)

Black and white image of men at an archeological excavation at Willow Beach near Lake Mohave. Standing at the left is H.O. Watts.

Black and white image of H. O. Watts who appears to be sifting sand at an archeological excavation site at Willow Beach near Lake Mohave.

Black and white image of H.O. Watts and others (possibly Bob Webb, Ann Helms and Barbara Russell) during an archeological excavation at Willow Beach near Lake Mohave.