United States. Interstate Commerce Commission. (1933). Freight and Passenger Service Operating Statistics of Class I Steam Railways in the United States, July 1933. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Interstate Commerce Commission. Freight and Passenger Service Operating Statistics of Class I Steam Railways in the United States, July 1933. [Washington]: [s.n.], 1933.
MLA (9th ed.) CitationUnited States. Interstate Commerce Commission. Freight and Passenger Service Operating Statistics of Class I Steam Railways in the United States, July 1933. [s.n.], 1933.
Warning: These citations may not always be 100% accurate.