The Alice Lake-Rockwell and Earl Rockwell Photographs depict the Las Vegas, Nevada area from approximately 1880 to 1962. The photographs primarily depict the Lake-Rockwell Family in Las Vegas, including Earl Rockwell with a local baseball team, the Las Vegas Volunteer Fire Department, and the Las Vegas Police. Other photographs include the Hoover (Boulder) Dam construction site and views of the completed dam. The photographs also portray family members from the Rockwell Family.

The Ernest Mitchell Pratt Photographs (approximately 1932-1936) consist of black-and-white photographic prints, signed and unsigned, taken by Pratt while Hoover Dam was under construction. Many prints are signed and mounted, and two are noted as award-winning photographs shown at the Annual International Salon of Camera Pictorialists in Los Angeles, California. There are additional working prints included alongside the final prints for most of the scenes. Also included in the collection is one small photograph of Pratt. This collection was formerly known as the Price Photograph Collection.