02039oam 2200553I 450 991070690120332120180205161013.0(CKB)5470000002458451(OCoLC)974933006(EXLCZ)99547000000245845120170309d1940 ua 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierTechnology, employment, and output per man in copper mining /by Y. S. Leong [and five others]Philadelphia, Pennsylvania :Work Projects Administration, National Research Project :Department of the Interior, Bureau of Mines,1940.1 online resource (xvi, 260 pages) illustrationsMineral technology and output per man studies ;report no. E-12"Work Projects Administration, National Research Project, in cooperation with Department of the Interior, Bureau of Mines.""February 1940."No FDLP item number available.Includes bibliographical references.Copper mines and miningUnited StatesMinersUnited StatesMining machineryCopper mines and miningfastMinersfastMining machineryfastUnited StatesfastCopper mines and miningMinersMining machinery.Copper mines and mining.Miners.Mining machinery.Leong Yau Sing1899-1412212National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.),United States.Bureau of Mines,KUKKUKOCLCFOCLCAGPOBOOK9910706901203321Technology, employment, and output per man in copper mining3505118UNINA