Black and white image of concrete being placed into the side walls of diversion tunnel #4 at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of concrete being placed into the side walls of diversion tunnel #4 at Hoover Dam. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam construction, including work on the dam forms and intake towers. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white image of Hoover Dam's downstream face and intake towers from the lookout point on the Nevada side. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Black and white photographic postcard of Hoover (Boulder) Dam outlets. Printed text on front of ppostcard: "Water discharge from both Arizona and Nevada canyon wall outlets, Boulder Dam."
A group of men at the Boulder Dam (Hoover Dam) groundbreaking ceremony. The man in the Masonic apron is Rev. Charles Sumner Reynolds, pastor of the Las Vegas Methodist Church.
Black and white image of Hoover Dam with the following printed text: "First 8 cubic yard batch of concrete being placed in Boulder Dam proper." Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Postcard of the downstream face and powerhouses, Hoover Dam. Caption on back: "Hoover (Boulder) Dam showing Fortification Mountain." "P10567. Color by David Mills."