Hager, Dorsey, 1921, Oil possibilities of the Holbrook area in northeast Arizona: Privately published. Authors Hager, Dorsey Publication Date 1921 Citation Privately published. State AZ Province CP County AP NA Placenames Little Colorado River Valley Holbrook area Petrified Forest area Puerco River area St. Johns area Keywords Carbon Dioxide Helium Hydrogen Sulfide Natural Gas Nitrogen Petroleum Exploration More Keywords Carbon Dioxide, Helium, Hydrogen Sulfide, Natural Gas, Nitrogen, Petroleum, Exploration, AzGeoBib RefNum 12267