The Boulder City 31ers Photograph Collection depicts the construction of the Hoover (Boulder) Dam and the development of Boulder City, Nevada from 1930 to 1987. The photographs primarily depict construction of the Hoover Dam, but they also depict workers, dormitories, the Colorado River, stores, and Black Canyon.
Description printed on photograph's accompanying strip of paper: "Howard Hughes speaking into a mike at Paris before leaving for Moscow on the second leg of his round the world flight 7-12-1938"