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- a41004378 contributor B12841967.
- a41004378 contributor B12841968.
- a41004378 created "[1939]".
- a41004378 date "1939".
- a41004378 date "[1939]".
- a41004378 dateCopyrighted "[1939]".
- a41004378 description "Includes bibliographical references.".
- a41004378 extent "2 v. (xxx, 436 p.) :".
- a41004378 isPartOf "Mineral technology and output per man studies ; report no. E-9".
- a41004378 issued "1939".
- a41004378 issued "[1939]".
- a41004378 language "eng".
- a41004378 publisher "Philadelphia, Pa. : Work Projects Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines,".
- a41004378 spatial "United States.".
- a41004378 subject "Bituminous coal.".
- a41004378 subject "Coal miners United States.".
- a41004378 subject "Coal mines and mining United States.".
- a41004378 subject "Coal-mining machinery.".
- a41004378 subject "TN23 .N35".
- a41004378 title "Mechanization, employment, and output per man in bituminous-coal mining / by Willard E. Hotchkiss ... [et al.].".
- a41004378 type "text".