The Merle Frehner Map of St. Thomas, Nevada (1981) consists of a hand-drawn map by Frehner of St. Thomas, Nevada who lived there from 1914 to 1932. The town was abandoned in 1933 due to the construction of Hoover Dam and is now beneath the waters of Lake Mead. Also included are instructions to the Geography 135 class at University of Nevada, Las Vegas to reproduce the map, which became a student project.

The collection contains materials (1967-1991) collected by Sheilagh Brooks predominantly during her time serving on various boards and committees under the Nevada Division of Historic Preservation and Archaeology. Materials include agendas, meeting minutes, correspondence, administrative reports, policies, budget plans, grant applications and guidelines for various federal and state departments. The collection also contains the applications of Nevada sites for the National Register of Historic Places.