Black and white image of Old Callville with the following printed description: The deserted town of Old Callville looking downstream. Shows largest building approximately 30' X 120' and built of masonry.

Black and white image of the proposed Black Canyon Reservoir, near a boat landing. Fortification Hill is visible in the background.

Black and white image of businessmen and engineers affiliated with Hoover Dam. From left to right: W. A. Bechtel, First Vice President, Six Companies, Inc.; Walker R. Young, Construction Engineer, Bureau of Reclamation; Elwood Mead, Commissioner, Bureau of Reclamation, F. T. Crowe, General Superintendent, Six Companies, Inc.; R. F. Walter, Chief Engineer, Bureau of Reclamation. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of three employees from the Stenographic Office at the Bureau of Reclamation with the following printed description: "Left to right: Hannah Houn, Stenographer; Cecile M. Dotson, Mails and File Clerk; Rose V. Crippa, Stenographer."

Black and white aerial image of several high scalers at work at the Hoover Dam construction site, specifically in the location for the Arizona-side intake towers. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Herbert Hoover and several others touring the Boulder Canyon Project. The following printed description accompanies the image: "President Herbert Hoover and official party in Tunnel No. 2 during inspection tour of Boulder Canyon Project. Left to right: Construction Engineer W. R. Young, Bureau of Reclamation; Mr. Ritchey , Secretary to the President; Chief Engineer R. F. Walter, Bureau of Reclamation; Mrs. Hoover; President Hoover; Mrs. Wilbur; Secretary of the Interior R. L. Wilbur; E. O. Wattis, First Vice-President, Six Companies, Inc.; F. T. Crowe, Gen. Superintendent, Six Companies , Inc." 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.