Fluorspar Allen, Milton Arthur 1890- creator Butler, G. M. (Gurdon Montague) 1881- joint author. text azu Tucson, Ariz 1921 monographic eng
print
19 p. 23 cm. by M. A. Allen and G. M. Butler. Published by the University of Arizona, Arizona Bureau of mines. At head of title: ... University of Arizona bulletin. Cover title. "Selected bibliography": p. 18-19. Fluorspar TN948.F6 A4 402(274)Ar4 MN 1.3:B 85/114 MN 1.3:B 85/114 [Arizona. State bureau of mines] Bulletin no. 114. Mineral technology series, no. 25 gs 21000322 U.S. Geol. Survey. Library 770720 20260227111325.0 gs 21000322