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- catalog contributor b1935600.
- catalog created "1897.".
- catalog date "1897".
- catalog date "1897.".
- catalog dateCopyrighted "1897.".
- catalog extent "iii, 270 p.".
- catalog hasFormat "Block signal operation.".
- catalog isFormatOf "Block signal operation.".
- catalog issued "1897".
- catalog issued "1897.".
- catalog language "eng".
- catalog publisher "New York, D. Van Nostrand,".
- catalog relation "Block signal operation.".
- catalog subject "Railroads Signaling Block system Handbooks, manuals, etc.".
- catalog subject "Railroads Signaling Block system.".
- catalog subject "TF630 .D43".
- catalog title "Block signal operation. A practical manual by Wm. L. Derr.".
- catalog type "text".