Born-Digital or AnalogAnalogTranscriptPetroleum. Colorado Oil shales of Colorado. COLORADO SCHOOL OF MINES Q., v.14, no.4 p.7 Discovered near Gunnison. Colo. W. Rep. Nov.5,1881 p 2 c 9 See Colo. ExchangE JOUNRAL Supplement 1888 p 6 1 Oil wells of Colo. Colo. Sun. June 12, 1892 p.19 Oil wells of Colorado. Repub. Jan. 1, 1885, p.9CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
