The Chester R. Longwell Professional Papers (1886-1974) document Longwell's professional career as a geologist and his pioneering field work in Clark County, Nevada. Included are Longwell's field notes; manuscripts, articles and speeches related to geology; personal and business correspondence; professional publications; subject and name files; specimen tags; photographic prints, negatives, and slides; and geological and topographical maps, primarily of Nevada, California, Arizona, and Utah.

The Claudine Williams Papers (1956-2009) contain awards, contracts, personal and business correspondence, newspaper clippings, and photographs pertaining to Las Vegas, Nevada businesswoman and philanthropist, Claudine Williams. The collection also includes extensive information on her hotel and gaming properties, including the Silver Slipper Gambling Hall, Holiday Casino, and Harrah's Hotel and Casino, as well as her honorary doctoral degree, medals, and audiovisual materials of interviews, news reports, and events.

The Maurine and Fred Wilson and Dr. William S. Park Audiovisual Collection (approximately 1900s-1970s) consist of audiovisual material created by the Wilson and Park families. The materials depict the Park homes in Las Vegas, Nevada; Park and Wilson family members; outdoor activities and vacation trips to California, Colorado, and Mexico. The collection also documents early views of the Kiel Ranch in Las Vegas, Nevada, community parades and events, and early views of Las Vegas in the 1920s.