02442oam 2200601 450 991071156120332120190118140501.0(CKB)5470000002484438(OCoLC)761397010(EXLCZ)99547000000248443820111115d1939 ua 0engurgn|||||||||txtrdacontentcrdamediacrrdacarrierMechanization, employment, and output per man in bituminous-coal mining /by Willard E. Hotchkiss [and seven others]Philadelphia, Pennsylvania :Work Projects Administration, National Research Project :Department of the Interior, Bureau of Mines,1940.1 online resource (2 volumes (xxx, 436 pages)) illustrationsMineral technology and output per man studies ;report no. E-9"Work Projects Administration, National Research Project, in cooperation with Department of the Interior, Bureau of Mines.""August 1939."No FDLP item number available.Includes bibliographical references.Bituminous coal industryUnited StatesStatisticsBituminous coal mines and miningLabor productivityUnited StatesStatisticsCoal minersEffect of technological innovations onUnited StatesCoal-mining machineryUnited StatesCoal minersfastCoal-mining machineryfastUnited StatesfastStatistics.lcgftBituminous coal industryBituminous coal mines and miningLabor productivityCoal minersEffect of technological innovations onCoal-mining machineryCoal miners.Coal-mining machinery.Hotchkiss Willard E(Willard Eugene),1874-1956,1395408National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.),United States.Bureau of Mines,OCLCEOCLCEOCLCQOCLCFOCLCOOCLCQOCLCAGPOBOOK9910711561203321Mechanization, employment, and output per man in bituminous-coal mining3453893UNINA