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- catalog contributor b7268891.
- catalog created "1937.".
- catalog date "1937".
- catalog date "1937.".
- catalog dateCopyrighted "1937.".
- catalog extent "iii, 64 p.".
- catalog issued "1937".
- catalog issued "1937.".
- catalog language "eng".
- catalog publisher "Washington, U. S. Govt. print. off.,".
- catalog spatial "United States.".
- catalog subject "Railroads Signaling United States.".
- catalog subject "TF615 .U65 1937".
- catalog title "Railway signal systems. Hearing before the Committee on interstate and foreign commerce. Hearing, Seventy-fifth Congress, first session, March 19, 1937.".
- catalog type "text".