| Reference | {Deposit:: U.S. BUREAU OF MINES, 1995, SPATIAL DATA EXTRACTED FROM THE MINERALS AVAILABILITY SYSTEM/MINERAL INDUSTRY LOCATION SYSTEM (MAS/MILS): U.S. BUREAU OF MINES SPECIAL PUBLICATION 12-95.}{Deposit:: HEYL AND OTHERS, USGS BULLETIN 1202-B, P. 11.}{Deposit:: BASTIN, E.S., 1931, THE FLUORSPAR DEPOSITS OF HARDIN AND POPE COUNTIES, ILLINOIS: ILLINOIS STATE GEOLOGICAL SURVEY BULLETIN 58, 116 P.}{Production:: WELLER AND OTHERS, 1952, P. 139.} |