Reference | {Deposit:: MSHA INSPECTION REPORT 7-18&19-72.}{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. 85.}{Deposit:: RCF LIST 10/81} |