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Geologic map of bastnaesite deposits, Birthday claims, San Bernardino County, California
W. N. Sharp, L.C. Pray
1952, Miscellaneous Field Studies Map 4
In April 1949 a deposit containing considerable quantities of the rare mineral bastnaesite - the fluorocarbonate of cerium, lanthanum, and other rare earths - was discovered near Mountain Pass, San Bernardino County, Calif.  Small quantities of bastnaesite have been found in several places in the United States, but this area...