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Black and white image of Hoover Dam with the accompanying description: "Placing concrete in block at mid-section of Dam. Eight cu. yd. bucket handled by cableway is in use." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "Evaporation tower for dam precooling system located on downstream cofferdam. View from Nevada outlet house bench." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "View looking upstream in the Nevada turbine gallery. The runner for turbine N-2 has been placed and the wicket gates are about to be set." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "View of Memorial Day crowds waiting to visit the powerplant. Note persons holding tickets ready for guide to collect. Roof of cashier's booth may be seen beyond awning." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following printed description: "View of 50-foot diameter tunnel below Arizona Tunnel Plug outlet works with Stoney Gate at end of tunnel lowered." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image of Hoover Dam with the following description (provided by Special Collections): "View of bank 287.5 KVV transformers along the ramp of the Arizona powerhouse. April 1941." Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Black and white image with the following printed description: "Boat dock on Nevada side of Colorado River operated by permittees." Sign at dock is for Murl Emery Boats and advertises "Eleven years on the Colorado River" with tours to Boulder Dam and Boulder Canyon. Note: Hoover Dam was officially renamed Hoover Dam in 1947.