02111oam 2200601I 450 991071428510332120181105103624.00-259-68724-3(CKB)5470000001200906(OCoLC)746261998(EXLCZ)99547000000120090620110810d1940 ua 0engurgn|||||||||txtrdacontentcrdamediacrrdacarrierRock drilling /by C.E. Nighman and O.E. KiesslingPhiladelphia, Pennsylvania :Work Projects Administration, National Research Project :Department of the Interior, Bureau of Mines,1940.1 online resource (xiii, 158 pages) illustrationsMineral technology and output per man studies ;report no. E-11"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.Rock DrillingRock-drillsUnited StatesMinersEffect of technological innovations onUnited StatesLabor productivityUnited StatesMinersfastRock-drillsfastUnited StatesfastRock-drillsMinersEffect of technological innovations onLabor productivityMiners.Rock-drills.Nighman C. E.1406942Kiessling O. E(Oscar Edward),1901-1993,National Research Project on Reemployment Opportunities and Recent Changes in Industrial Techniques (U.S.),United States.Bureau of Mines,OCLCEOCLCEOCLCQOCLCFOCLCQOCLCOOCLCQGPOBOOK9910714285103321Rock drilling3487124UNINA