Archival objects in this container: Hoover Dam, Lake Mead, Black Canyon, and surrounding area, approximately 1935-1950 Catwalk during the Hoover Dam construction period, approximately 1930-1935 Floor of Black Canyon during Hoover Dam construction, approximately 1930-1933 Truck moving dirt during Hoover Dam construction, approximately 1930-1935 Dog named "Nig" that was adopted as a mascot by the workers at Hoover Dam, approximately 1933-1934