Born-Digital or AnalogAnalogTranscriptPetroleum. Colorado. History "The oil and gas industry of Colorado," by Clark F. Barb. Rocky Mt. Petroleum Yr. Bk. 1944 P-93-99 History of petroleum. Colorado Year Book 1935-1936 p.213CollectionWestern History Subject IndexRelated MaterialWestern History Subject Index AbbreviationsType of MaterialIndex CardLanguageeng
