The Irma McGonagill Papers (1907-1970) document her life in Tonopah, Nevada. The collection includes handwritten notes about her life in Tonopah, a stock certificate from the Silver Bow mine, and correspondence with Nanelia S. Doughty about life in Tonopah.

The Harry Floyd Alter Photograph Collection (1905-1916) is comprised of black-and-white photographic prints and negatives. The images depict scenes in Las Vegas, Nevada, including the Las Vegas Ranch, the Arizona Club, and baseball teams and fields. Also included are images of Harry Floyd Alter and his friends.

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 Miss Nevada U.S.A. Pageant Programs contain souvenir programs from the Miss Nevada U.S.A. Pageants held at the Holiday Casino in Las Vegas, Nevada from 1981 to 1985. These programs showcase the pageant contestants and feature advertisements from event sponsors. The collection also contains one souvenir program from the Miss Nevada Teen U.S.A. Pageant held in 1985.