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Mechanization, employment, and output per man in bituminous-coal mining

Por: Hotchkiss, Willard E.
Tipo de material: materialTypeLabelLibro Editor: Philadelphia: Work Projects Administration, National Research Project in cooperation with Department of the Interior, Bureau of Mines, 1939Descripción: 2 ts. ilus., tbls.Tema(s): CARBON BITUMINOSO | MINAS | MINERIAClasificación CDU: A/622.334/H77
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