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.

The Sheilagh Brooks Collection on Nevada Historical Sites and Museums dates from 1977 to 1983. It contains materials including budgets, planning proposals, agenda, and minutes related to the Nevada State Museum, including proposals to build a state museum in Southern Nevada. The collection also contains National Register of Historic Places nomination forms for sites throughout Nevada.