An image of power generators at Hoover Dam. Caption on image reads: "Interior of powerhouse at Boulder Dam, with six 115,000-H.P generators installed. Service Bureau photo." Boulder Dam was officially renamed Hoover Dam in 1947.
A colored postcard showing an artist's representation of the transportation of a pipe necessary for the construction of Boulder Dam, a title that was later changed to Hoover Dam. Transcribed onto the top border of the image: "Transporting Pipe, Boulder Dam."