%0 Book %A Landis, Edwin R. %I United States Government Printing Office %D 1959 %C Washington %D 1959 %G English %B Contributions to economic geology %~ Universitätsbibliothek "Georgius Agricola" %T Coal resources of Colorado %Z https://katalog.ub.tu-freiberg.de/Record/0-1170943926 %U https://katalog.ub.tu-freiberg.de/Record/0-1170943926