01379cam a22003251 4500 gs 54000292 DLC 20260227111402.0 780708s1953 dcuabd b f000 0 eng gs 54000292 (OCoLC)4032119 DLC OClU ISS OCoLC DLC premarc QE75 .P9 no. 245 TN490.T9 L6 Copy 2. 553.46 I 19.16:245 Lovering, T. S. (Thomas Seward), 1896-1991. Geology and ore deposits of the Boulder County tungsten district, Colorado, by T. S. Lovering and Ogden Tweto. [Prepared in cooperation with the State of Colorado through the Colorado Geological Survey board and the Colorado Metal Mining Fund] Washington, U.S. Govt. Print. Off., 1953. viii, 199 p. illus., maps, diagrs., plans, tables. 29 cm. Geological Survey (U.S.). Professional paper, 245 Part of the illustrative material is folded, part colored, part in pocket. "List of references": p. 192-196. Geology Colorado Boulder County Petrology Colorado Boulder County Tungsten ores Colorado Boulder County Tungsten mines and mining Colorado Boulder County Tweto, Ogden, 1912-1983, joint author. 28905 28905