Born-Digital or AnalogAnalogTranscriptPetroleum. Colorado Colorado oil fields. Mining Industry and tradesman v.10, #4, Jan. 14, 1892, p.36 Oil in Colorado. Rocky Mountain News Dec. 8, 1865 p.2 c.1 Colorado oil history. Good article. Republican Jan. 188'7 Oil found in vicinity of Barela, Colorado. DENVER Times Oct. 15, 1899 p.3 c 3CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
