Black and white image showing the completed construction of Diversion Tunnel No. 4, one of four 50-foot diversion tunnels at Hoover Dam. Construction men can be seen at the base of the tunnel. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

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.

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.

An image of a project poster depicting the Hoover Dam when it was first planned to be built in Boulder Canyon. Later constructed in Black Canyon where less rock faults were found, Hoover Dam was built in the 1930s on the Colorado River between Arizona and Nevada. Note: Boulder Dam was officially renamed Hoover Dam in 1947.

Harry Brown, born in Independence, Missouri in 1912, moved to Las Vegas with his wife in 1934 during the Great Depression in order to start working on the Boulder Dam. Brown continued his occupation as a carpenter throughout the years while living in Las Vegas and resided in several properties with his family in Las Vegas and North Las Vegas. During the interview, Brown describes some of his experiences from being in the Sheriff’s Mounted Posse, the equivalent of a modern search and rescue team, which was deputized by the sheriff. Brown additionally describes the tradition of the Helldorado parades, in which he was a part, and he provides his overall thoughts on living in Las Vegas.

Black and white image of Hoover Dam with the following printed description: "Thirty-foot-diameter-steel-penstock pipe set up from joint assembly at the Babcock and Wilcox Co. Plant." Note: Boulder Dam was officially renamed Hoover Dam in 1947.