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- 31005792 contributor B767252.
- 31005792 created "1931.".
- 31005792 date "1931".
- 31005792 date "1931.".
- 31005792 dateCopyrighted "1931.".
- 31005792 extent "4 p. l., 123 p.".
- 31005792 issued "1931".
- 31005792 issued "1931.".
- 31005792 language "eng".
- 31005792 publisher "[Baltimore, Printed by the 20th century printing co.]".
- 31005792 subject "622.33 [621.392233]".
- 31005792 subject "Coal mines and mining.".
- 31005792 subject "Electricity in mining.".
- 31005792 subject "TN343 .E55".
- 31005792 title "Electricity applied to coal mining.".
- 31005792 type "text".