01024cam a22003011 4500 gs 18000313 DLC 20260227111322.0 770719s1918 azu 000 0 eng c gs 18000313 (OCoLC)3125801 U. S. Geol. Survey. Library TxEU OCoLC DLC premarc TN490.M3 A4 TN24.A6 A35 no. 91 Copy 2. MN 1.3:B 85/91 azdocs Allen, Milton Arthur, 1890- . Manganese, by M. A. Allen and G. M. Butler. Tucson, Ariz., University of Arizona, Bureau of mines [1918] 32 p. 23 cm. Arizona. State bureau of mines. Bulletin no. 91. Mineral technology series, no. 19 Cover title. At head of title: ... University of Arizona bulletin. "References": p. 32. Manganese. Manganese ores. Butler, G. M. (Gurdon Montague), 1881- joint author. 25863 25863