Reference | {Deposit:: WELLER M J ET AL GEOLOGY OF THE FLUORSPAR DEPOSITS OF ILLINO}{Deposit:: ILL STATE GEOL SUR BULL 76 1952 P 135}{Reserve-Resource:: BURMEISTER, H. L. KNOX AND YINGLING FLOURITE MINES, HARDIN}{Reserve-Resource:: COUNTY, ILLINOIS. BUMINES RI 4856, 1952, 8 PP.} |