The George Kelly Ryan papers (1921-1971) contain correspondence inquiring about Octavius Decatur "O. D." Gass, newspaper clippings from 1929, handwritten recollections of the Gold Ranch by Laura Royce, and a San Pedro, Los Angeles and Salt Lake Railroad Company information, including information on wash-outs in Nevada.

The Southern Nevada Chapter of the American War Mothers Organization Records (1947-1995) are comprised primarily of scrapbooks containing correspondence and minutes, numerous newspaper clippings, and photographs. Also included are pamphlets on American War Mothers organizational rituals, bylaws, history, ceremonial ephemera, flags, and a Henderson Chapter Charter. The materials also contain items relating to the North Las Vegas Chapter, the Rose Garden Chapter, and the State Chapter.

The Bureau of Reclamation Photographs of the Hoover Dam and Boulder City, Nevada depict the construction of the Hoover (Boulder) Dam and the development of Boulder City, Nevada from 1869 to 1974, with a bulk of the materials dating from 1929 to 1940. The photographs primarily depict the construction operations in Black Canyon, including digging tunnels, pouring concrete, building the power plant, and inspections by Bureau of Reclamation engineers. The photographs also depict Boulder City, including schools, workers, and dormitories. The collection also includes photographs of St. Thomas, Nevada, Lake Mead, Nelson’s Landing, Nevada, and an archaeological excavation near Lake Mohave, Nevada.

The Robert B. Griffith Collection (1928-1975) documents the work of Robert B. Griffith, an instrumental figure in the development of water resources in Las Vegas, Nevada, as well as the creation of McCarran International Airport and Nellis Air Force Base. The collection consists of Colorado River Commission papers, 1928 International Air Race documents, general correspondence, a feasibility study, an airport guide, American Legion papers, the memoirs of Alfred Merritt Smith, and death and burial records belonging to his father. The collection also includes slides from various countries, including the United States, Canada, Europe, Asia, and the Middle East.

The Albert S. Henderson Papers (1879-1962), document his career and service as a district judge in Las Vegas, Nevada. Included are correspondence, a personal statement from his election campaign, certificates and proclamations, his memorial book, numerous newspaper clippings, an 1879 edition of Eureka and Its Resources, and various ephemera: union cards, name tags, and election cards.