01143cam a22002891  4500001001300000003000400013005001700017008004100034010001700075035001900092040004800111042001200159043001200171050002200183051002600205082001100231100003000242245025200272260004800524300003900572410005500611500005000666504003100716650004200747650004700789999001700836gs 50000051 DLC20260227111356.0801205s1949    dcuab    b   f001 0 eng c  ags 50000051   a(OCoLC)7003435  aU.S. Geol. Survey. Libr.cNcGrEdOCoLCdDLC  apremarc  an-us-co00aQE75b.P9 no. 219  aTN24.C2bE25cCopy 2.  a557.881 aEckel, Edwin Butt,d1906-10aGeology and ore deposits of the La Plata district, Colorado,cby Edwin B. Eckel with sections by J. S. Williams, F. W. Galbraith and others. Prepared in cooperaton with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund.  aWashington,bU.S. Govt. Print. Off.,c1949.  avii, 179 p.billus., maps.c29 cm.20aGeological Survey (U.S.).tProfessional paperv219  aPart of illustrative matter folded in pocket.  aBibliographical footnotes. 0aGeologyzColoradozLa Plata district. 0aOre depositszColoradozLa Plata district.  c28437d28437