01066cam a22002891 4500 gs 22000062 DLC 20260227111326.0 761007s1921 azu 000 0 eng gs 22000062 (OCoLC)2487088 DLC OT OCoLC ABAU OCoLC DLC premarc TN1 .A65 no. 4, 1921 MN 1.3:B 85/116 azdocs Butler, G. M. (Gurdon Montague), 1881- Petroleum, by G. M. Butler and M. A. Allen ... Tucson, Ariz., University of Arizona, Bureau of Mines, 1921. Cover-title, 45 p. Arizona. State Bureau of Mines. Bulletin, no. 116. Oil series, no. 4 At head of title: ... University of Arizona bulletin. "Selected bibliography": p. 44-45. Petroleum Geology. Allen, Milton Arthur, 1890- joint author. University of Arizona. State Bureau of Mines. Bulletin. University of Arizona. Bulletin ; v. 2, no. 1. 26156 26156