| Reference | {Deposit:: HEYL, A.V., BROCK, M.R., JOLLY, J.L., AND WELLS, C.E., 1965 , REGIONAL STRUCTURE OF THE SOUTHEAST MISSOURI AND ILLINOIS-KENTUCKY MINERAL DISTRICTS, U.S. GEOLOGICAL SURVEY BULL. 1202-B, P. B1 - B20 .}{Deposit:: BROBST, DONALD A., 1965 , BARITE IN THE UNITED STATES, U.S.G.S. MR-43} |