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.

The Edith Giles Barcus Family Papers document the lives and work of three related individuals who lived in Goldfield, Nevada: noted mining engineer Edwin S. Giles who settled in Goldfield in 1907, his daughter Edith Giles who was raised in Goldfield, and Clyde Barcus, also a mining engineer, who came to Goldfield in 1923 and married Edith Giles soon thereafter. The papers date from 1848 to 1979 and document the business and personal lives of two generations of the Giles-Barcus family in Goldfield and Las Vegas, Nevada. The collection includes: property, commercial, financial, and mining records; mining and engineering reports; notes on minerals; correspondence; and photographs of the family, Goldfield, and travel shots of the western United States.