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- 21012712 contributor B611648.
- 21012712 contributor B611649.
- 21012712 created "[c1921]".
- 21012712 date "1921".
- 21012712 date "[c1921]".
- 21012712 dateCopyrighted "[c1921]".
- 21012712 extent "248 p.".
- 21012712 issued "1921".
- 21012712 issued "[c1921]".
- 21012712 language "eng".
- 21012712 publisher "Chicago, Ill., The Brotherhood of railroad signalmen of America".
- 21012712 subject "Railroads Signaling.".
- 21012712 subject "TF615 .V3".
- 21012712 title "The signalman and his work, by Kenneth L. Van Auken.".
- 21012712 type "text".