The Southern Nevada Historical Society Photograph Collection on Basic Magnesium, Inc. contains photographs of the construction of Basic Magnesium Inc.'s plants and buildings from 1941 to 1942. The photographs primarily depict aerial views of the plant site and various buildings, including the administration building, tent camp, chlorination buildings, electrolysis facilities, electrical distribution systems, and warehouses. The photographs also depict Lake Mead and the early buildings in Henderson, Nevada.

The Stuart and Flora Mason Photographs (1940-1999) contain photographs of hotels, casinos, and other buildings constructed by Taylor International Corporation, which was owned by the Mason Family. The photographs depict the Aladdin, Venetian, Tropicana, Riviera, MGM Grand, and International hotels and casinos in Las Vegas, Nevada. The photographs also depict buildings in Miami and Coral Gables, Florida, and San Juan, Puerto Rico.

Collection is comprised of photographs of Las Vegas, Nevada community leaders Flora and Stuart Mason and three event programs from Temple Beth Sholom (Las Vegas, Nevada). Materials date from approximately 1965 to 2010.

The Helen J. Stewart Photographs depict the Stewart Family from approximately 1860 to 1950. The photographs primarily depict Helen J. Stewart and her children as well as the Stewart Ranch (also know as the Las Vegas Ranch) in Southern Nevada. The photographs include the early Las Vegas, Nevada town site, landscapes of Southern Nevada and the American Southwest, mines and mining camps, railroads and railroad workers, the Las Vegas Fort (also known as the Old Mormon Fort), hotels and early businesses in Las Vegas, Native Americans and Native American artifacts, and postcards.