01211nam 2200361 450 991071672910332120210826152336.0(CKB)5470000002524887(OCoLC)1265302264(EXLCZ)99547000000252488720210826d2021 ua 0engurcn|||||||||txtrdacontentcrdamediacrrdacarrierSurface-mining modeling for USGS coal assessments /by Paul E. PierceReston, Virginia :U.S. Department of the Interior, U.S. Geological Survey,2021.1 online resource (iv, 13 pages) color illustrationsOpen-file report ;2021-1059Includes bibliographical references (page 12).Coal mines and miningStrip miningMathematical modelsCoal mines and mining.Strip miningMathematical models.Pierce Paul E.1412227Geological Survey (U.S.),GPOGPOBOOK9910716729103321Surface-mining modeling for USGS coal assessments3505177UNINA