LEADER 01796oam 2200505 450 001 9910698621903321 005 20150917145818.0 035 $a(CKB)5470000002436428 035 $a(OCoLC)882122389 035 $a(EXLCZ)995470000002436428 100 $a20140630d1923 ua 0 101 0 $aeng 135 $aurbn||||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 14$aThe Twentymile Park district of the Yampa coal field, Routt County, Colorado /$fby Marius R. Campbell 210 1$a[Washington, D.C.] :$cDepartment of the Interior, United States Geological Survey,$d1923. 210 2$aWashington :$cGovernment Printing Office. 215 $a1 online resource (iv, 82 pages, XIII pages of plates) $cillustrations 225 1 $aBulletin / Department of the Interior, United States Geological Survey ;$v748 300 $aTitle from title screen (viewed June 26, 2014). 320 $aIncludes bibliographical references and index. 517 1 $aTwentymile Park district, Colorado 606 $aGeology, Economic$zColorado$zYampa 606 $aMines and mineral resources$zColorado$zYampa 606 $aCoal$zColorado$zYampa 606 $aCoal$2fast 607 $aColorado$zRoutt County$2fast 615 0$aGeology, Economic 615 0$aMines and mineral resources 615 0$aCoal 615 7$aCoal. 700 $aCampbell$b Marius R$g(Marius Robinson),$f1858-1940,$0810150 712 02$aGeological Survey (U.S.), 801 0$bCOP 801 1$bCOP 801 2$bOCLCO 801 2$bOCLCF 801 2$bOCLCA 801 2$bGPO 906 $aBOOK 912 $a9910698621903321 996 $aThe Twentymile Park district of the Yampa coal field, Routt County, Colorado$93505865 997 $aUNINA