Black and white image of the group of men who witnessed the pouring of the first concrete in Hoover Dam proper. From left to right: H. J. Lawler, Director of Six Companies, Inc.; Walker R. Young, Construction Engineer, U.S. Bureau of Reclamation; Frank T. Crowe, General Superintendent, Six Companies, Inc.; C. A. Shea, Director of Construction, Six Companies, Inc. W. A. Bechtel, President, Six Companies, Inc.; R. F. Walter, Chief Engineer, U.S. Bureau of Reclamation; Theodore A. Walters, First Assistant Secretary of the Interior ; Ed Clark & C. P. Squires, members of the original Colorado River Commission. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
The Sidney R. Whitmore Collection (approximately 1885-1970) contains land deeds and other documents about Mount Diablo, Nevada; documents detailing parts of his family history; and eight framed paintings of landscapes and portraits.
The Jack Kent Tillar Papers (approximately 1890-2010) are comprised of magic-related books, periodicals, pamphlets, ephemera, and artifacts from the estate of Jack Kent Tillar who was a composer and music editor for the film and television industry. Materials also include a small amount of Tillar's personal papers. Tillar was an amateur mentalist magician and wrote numerous books and articles on the subject of telepathy and mentalism including The Assumption Swindle, Trio: Three Complete Acts for the Mentalist, and Solo: The Walk-Around Mentalist.