The Elton and Madelaine Garrett Photograph and Architectural Drawing Collection contains photographic prints and architectural drawings of Boulder (Hoover) Dam; Las Vegas, Nevada; Boulder City, Nevada; and other locations in the American Southwest from approximately 1927 to 1990. The photographs primarily depict Hoover Dam's construction and areas around Hoover Dam, Las Vegas, and Boulder City during the 1930s and 1940s. The bulk of the architectural drawings and maps are projects and diagrams related to the planning and development of Boulder City, Nevada between 1943 and 1985.

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 Crockett Family Photographs (approximately 1940-2008) are comprised of aerial photographs of Alamo Airport (later Harry Reid International Airport) and the surrounding Las Vegas Valley in the 1940s and 1950s. Photographs of the interior, exterior, and airfield at Alamo Airport document the early stages of what is now one of the busiest international airports in the United States. The collection also contains audiovisual material, which depict events including the Miss Rodeo America pageant and the Sahara Cup boat races on Lake Mead, and locations including Fremont Street in downtown Las Vegas, Nevada and Hoover Dam. A significant portion of the collection consists of photographs of the Crockett family at various events, on family vacations, and their home in Las Vegas, Nevada.