Reference | {Deposit:: ILL. GEOLOGICAL SURVEY PRINTOUT, WEEKS LIST}{Deposit:: MALHOTRA, R, AND P.A. SMITH. DIRECTORY OF ILLINOIS MINERAL}{Deposit:: PRODUCERS-1974. ILLINOIS STATE GEOLOGICAL SURVEY, MINERAL}{Deposit:: NOTE 64, JULY 1976, P. 77.}{Deposit:: # MEDUSA QUARRY IS THE LOWER LEVEL OF DIXON QUARRY.} |