The Nevada Desert Experience Records (1951-2009) are comprised of files from the anti-nuclear organization, the Nevada Desert Experience (NDE), as well as its predecessor, the Sagebrush Alliance, and those of earlier unincorporated protests at the Nevada Test Site (NTS). Materials include board of directors meeting minutes, financial records, scrapbooks, personnel records, event speeches, correspondence, newspaper clippings, cartoons and other artwork, newsletters, brochures, fliers, research files on nuclear issues and other anti-nuclear organizations, and congressional testimony. The records also contain audiovisual materials, photographic prints and slides, screenplays, manuscripts, and newspapers related to the NDE's media efforts.

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.