01796oam 2200505 450 991069862190332120150917145818.0(CKB)5470000002436428(OCoLC)882122389(EXLCZ)99547000000243642820140630d1923 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierThe Twentymile Park district of the Yampa coal field, Routt County, Colorado /by Marius R. Campbell[Washington, D.C.] :Department of the Interior, United States Geological Survey,1923.Washington :Government Printing Office.1 online resource (iv, 82 pages, XIII pages of plates) illustrationsBulletin / Department of the Interior, United States Geological Survey ;748Title from title screen (viewed June 26, 2014).Includes bibliographical references and index.Twentymile Park district, ColoradoGeology, EconomicColoradoYampaMines and mineral resourcesColoradoYampaCoalColoradoYampaCoalfastColoradoRoutt CountyfastGeology, EconomicMines and mineral resourcesCoalCoal.Campbell Marius R(Marius Robinson),1858-1940,810150Geological Survey (U.S.),COPCOPOCLCOOCLCFOCLCAGPOBOOK9910698621903321The Twentymile Park district of the Yampa coal field, Routt County, Colorado3505865UNINA