01272cam a22003131 4500 gs 55000233 DLC 20260227111403.0 780505s1954 dcuab b f000 0 eng gs 55000233 (OCoLC)3863499 DLC OClU ISS OCoLC DLC TN490.A2 O55 TN490.A2 O55 Copy 2. 553.49 I 19.16:261 Olson, Jerry Chipman, 1917- Rare-earth mineral deposits of the Mountain Pass district, San Bernardino County, California, by J. C. Olson [and others] with a foreword on History of the discovery at Mountain Pass, California, by D. F. Hewett. Washington, U.S. Govt. Print. Off., 1954. 75 p. illus., maps (part col.) 29 cm. Geological Survey (U.S.). Professional paper, 261 Part of the illustrative matter folded in pocket. Bibliography: p. 64-65. Rare earths Geology California San Bernardino County Mines and mineral resources California San Bernardino County Mines and mineral resources California History Mountain Pass district, San Bernardino County, California. 28971 28971