Reference | {Deposit:: ILLINOIS GEOLOGICAL SURVEY BULLETIN 76 P 104}{Deposit:: ILL GEOL SURV CIRCULAR 385 P 31}{Deposit:: ILL GEOL SURV BULL 41 P 295}{Deposit:: ILL GEOL SURV BULLETIN 59 P 23}{Deposit:: HOLLENBECK, R. P. FLUORSPAR IN THE EASTERN UNITED STATES.}{Deposit:: BUMINES IC 8339, 1967, P. 33.} |