Black and white image of workers placing concrete in column H-5 between elevation 630 and elevation 635 during the test pour made before the Hoover Dam Board of Consulting Engineers. 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."