Biblioteca - Ingemmet

Vista normal Vista MARC Vista ISBD

Hotchkiss, Willard E.

Mechanization, employment, and output per man in bituminous-coal mining - Philadelphia Work Projects Administration, National Research Project in cooperation with Department of the Interior, Bureau of Mines 1939 - 2 ts. ilus., tbls.

Subjects--Topical Terms:
CARBON BITUMINOSO
MINAS
MINERIA

Universal Decimal Class. No.: A/622.334/H77