The MGM Mirage Records on Mandalay Resort Group consists of materials from Mandalay Resort Group’s office of public relations and community affairs records, which was closed after Mandalay’s corporate merger with MGM Mirage in 2005. The files, dating from 1968 to 2005, provide documentation of Mandalay Resort Group’s external affairs and internal operations. They contain subject files, photographs, negatives, slides, correspondence, VHS tapes, corporate publications, press releases, press kits, wholesale room agreements, hotel ephemera, employee newsletters, and press clippings. Of particular interest are files and photographs documenting the planning, development, construction, and opening of the Mandalay Resort Group properties.

The Union Pacific Railroad Collection (1828-1986) is comprised of the original corporate records of the Union Pacific Railroad's operations in Southern Nevada, Utah, and Southern California, particularly focusing on Las Vegas and Los Angeles. The collection documents the purchase of Stewart ranch and the construction of the original depot and town which became modern Las Vegas. The collection also contains the records of the Las Vegas Land & Water Company (LVL&W), a subsidiary of the railroad formed in 1905 to handle the railroad's land transactions. The collection contains office files, correspondence, reports, leases, various legal, governmental and financial document, the collection contains large and small format maps, architectural and engineering drawings, published technical reports, railroad operational manuals, bound legal briefs, ledgers, and payroll and receipt books. The collection also includes the personal files of Walter Bracken, the Union Pacific's special representative in Nevada and vice president of the Las Vegas Land and Water Company, and a paper index of the collection materials.