The Elizabeth von Till and Claude N. Warren Professional Papers (1916-2021) are comprised of the personal and professional papers of anthropologist Claude N. Warren and historical preservationist Elizabth von Till Warren. The materials in this collection primarily consist of research files, maps, and drawings on various archaeological and historical preservation projects in southern Nevada of which they both were involved. This collection includes field notes and surveys from archaeological projects such as the Old Las Vegas Mormon Fort and the Las Vegas Springs Preserve. Records on von Till Warren's involvement with the Old Spanish Trail Association, Southern Nevada Historical Society, and historic preservation work around southern Nevada are represented. Also included are Robert H. Crabtree's archaeological research files, a colleague of Claude Warren who bequeathed his professional files to him upon his death.

The Charles S. Sprague and Benjamin Gill Papers on Nevada Mining (1904-1925) are comprised of various records from the mining companies owned and operated by businessmen Charles S. Sprague and Benjamin Gill who were active in the central Nevada boomtowns of Goldfield and Tonopah in the early twentieth century. Documents include correspondence, receipts and invoices, detailed records and copies of government legislative bills relating to the mining industry, and other business correspondence. Sprague's collection consists of his mining business correspondence dating from 1906 to 1925. Gill's papers are comprised of his business correspondence from 1916 to 1922.