United States. Interstate Commerce Commission. (1940). Comparative Statement of Railway Operating Statistics, Individual Steam Railways in the United States Having Annual Operating Revenues Over $5,000,000, Years 1939, 1938, 1937. and 1936. [publisher not identified].
Chicago Style (17th ed.) CitationUnited States. Interstate Commerce Commission. Comparative Statement of Railway Operating Statistics, Individual Steam Railways in the United States Having Annual Operating Revenues Over $5,000,000, Years 1939, 1938, 1937. and 1936. [Washington]: [publisher not identified], 1940.
MLA (9th ed.) CitationUnited States. Interstate Commerce Commission. Comparative Statement of Railway Operating Statistics, Individual Steam Railways in the United States Having Annual Operating Revenues Over $5,000,000, Years 1939, 1938, 1937. and 1936. [publisher not identified], 1940.