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- catalog contributor b6486094.
- catalog contributor b6486095.
- catalog contributor b6486096.
- catalog contributor b6486097.
- catalog contributor b6486098.
- catalog contributor b6486099.
- catalog created "[1939]".
- catalog date "1939".
- catalog date "[1939]".
- catalog dateCopyrighted "[1939]".
- catalog description "Includes bibliographical references.".
- catalog extent "2 v. (xxx, 436 p.) :".
- catalog hasFormat "Mechanization, employment, and output per man in bituminous-coal mining.".
- catalog isFormatOf "Mechanization, employment, and output per man in bituminous-coal mining.".
- catalog isPartOf "Mineral technology and output per man studies ; report no. E-9".
- catalog isPartOf "Mineral technology and output per man studies ; rept. no. E-9.".
- catalog issued "1939".
- catalog issued "[1939]".
- catalog language "eng".
- catalog publisher "Philadelphia, Pa. : Work Projects Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines,".
- catalog relation "Mechanization, employment, and output per man in bituminous-coal mining.".
- catalog spatial "United States.".
- catalog subject "Bituminous coal.".
- catalog subject "Coal miners United States.".
- catalog subject "Coal mines and mining United States.".
- catalog subject "Coal-mining machinery.".
- catalog subject "TN23 .N35 no. E-9".
- catalog title "Mechanization, employment, and output per man in bituminous-coal mining / by Willard E. Hotchkiss ... [et al.].".
- catalog type "text".