The Miriam "Mimi" Katz Papers are mainly comprised of materials documenting Katz's involvement with community organizations in Las Vegas, Nevada from the 1940s to 2015 (the bulk of the materials date from 2002 to 2014). A large portion of the collection consists of planning documents, correspondence, event programs, newsletters, meeting agendas, meeting minutes, photographs, and other records related to Katz's involvement in the Brandeis National Committee Las Vegas Chapter and the Temple Beth Sholom Women's League. The collection also includes similar types of materials that document Katz's work with other community groups such as the Jewish Community Center of Southern Nevada and the League of Women Voters, and her work on the political campaigns of Democratic state and federal politicians.

The Jim and Effie Spicer Papers (1979-1982) contain two chapters from the book The History of Pahrump Valley, which talks about the Spicers, newspaper clippings, and a transcribed copy of the diary of Jim Milligan, a miner from Nye County, Nevada.