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- catalog contributor b6485577.
- catalog contributor b6485578.
- catalog contributor b6485579.
- catalog contributor b6485580.
- catalog contributor b6485581.
- catalog created "[1940]".
- catalog date "1940".
- catalog date "[1940]".
- catalog dateCopyrighted "[1940]".
- catalog description "Includes bibliographical references.".
- catalog extent "xvi, 260 p. :".
- catalog isPartOf "Mineral technology and output per man studies ; Report no. E-12".
- catalog isPartOf "Mineral technology and output per man studies ; rept. no. E-12.".
- catalog issued "1940".
- catalog issued "[1940]".
- catalog language "eng".
- catalog publisher "Philadelphia, Pa. : Work Projects Administration, National Research Project in cooperation with Dept. of the Interior, Bureau of Mines,".
- catalog spatial "United States.".
- catalog subject "Copper mines and mining United States.".
- catalog subject "Miners United States.".
- catalog subject "Mining machinery.".
- catalog subject "TN23 .N35 no.E-12".
- catalog title "Technology, employment, and output per man in copper mining / by Y.S. Leong ... [et al.].".
- catalog type "text".