The J. Ross Clark, San Pedro, Los Angeles & Salt Lake Railroad series (1902-1921) contain the office files of J. Ross Clark, second Vice President of the San Pedro, Los Angeles & Salt Lake (SPLA&SL) Railroad, and younger brother of Montana Senator William Clark, who owned the railroad until he sold it to E.H. Harriman of the Union Pacific Railroad. J. Ross Clark’s Empire Construction company was responsible for the construction of the SPLA&SL Railroad. These files contain correspondence concerning Helen Stewart’s Las Vegas Ranch, which the railroad purchased, the management of the ranch after the Railroad took possession, the laying out of the Las Vegas townsite, the subsequent auction of the town lots, and the construction of the early railroad buildings in Las Vegas and California.

The Las Vegas Land & Water Company series (1905-1976). This series contains files kept by Walter Bracken, the resident Las Vegas agent of the Las Vegas Land & Water Company. Materials include leases of the railroad’s Las Vegas properties, as well as the construction, maintenance and management of the city’s water facilities. This series also includes Bracken's files of Las Vegas railroad operations. Bracken’s Las Vegas files were later transferred and incorporated into files kept in Los Angeles by the railroad’s General Manger, Manager of Properties, and Manager of Industrial Development, for railroad property and right-of-way in Nevada outside Las Vegas and in California. The series also contains the LVL&W corporate records, including Board of Directors meetings, correspondence, financial accounts, etc., which had always been kept in Los Angeles, as well as the later correspondence of the Las Vegas agents.

The United States Harbor Reports series (1914-1940) contains blueprints, photographs, and maps of freight terminals related to transportation in and around various United States seaports, including Boston, Massachusetts; Norfolk, Virginia; Baltimore, Maryland; New York City, New York; New Orleans, Louisiana; Philadelphia, Pennsylvania; Houston, Texas; and Los Angeles, California.