The Dr. William S. Park Papers (1926-1937) contain check receipts, books containing records of cash, expenses and summaries from his practice as a Las Vegas, Nevada dentist. There are personal receipts, memberships and donations, and utility bills. Also included are tax and assessment papers, travel expenses, and records for the Park Building.

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.