Butler, G.M., and Allen, M.A., 1921, Petroleum: Arizona Bureau of Mines Bulletin no. 116, 45 p. Authors Butler, G.M., and Allen, M.A. Publication Date 1921 Citation Arizona Bureau of Mines Bulletin no. 116, 45 p. State AZ Province BR County PM CH YA YU PM SC AP NA GM Placenames Whetstone Mts. Chino Valley San Simon Valley(CH) San Simon Valley(GM) Verde Valley Yuma area Sonoita Basin Holbrook area Little Colorado River Valley Puerco River area Pink Cliffs area Snowflake area Keywords Oil Shale Petroleum Exploration More Keywords Oil Shale, Petroleum, Exploration, AzGeoBib RefNum 1538