The General Manager, Manager of Properties, and Manager of Industrial Development in Los Angeles, California sub-series (1900-1976) consists of information related to the physical development of Union Pacific railroad towns and sites outside of Las Vegas, Nevada, including Yermo, California. Files include building leases, sales and purchases of land and water, accounting and other business practices, legislative matters, and industrial development along the Union Pacific rail routes.

The photographic prints, negatives, slides, and glass plate negatives series (1900-1974) consists of black-and-white and color prints and negatives of geological features, predominately in southern Nevada, California, and Arizona but including other locations in the United States, Europe, and Asia. Also included are photographs taken of the moon by the Mt. Wilson Observatory telescope, numerous negative albums, photographic slides used for instructional purposes, glass plate negatives, and several letters and documents associated with the photographic prints.