| 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:: JAMES, JACK A., 1949 , GEOLOGIC RELATIONSHIPS OF THE ORE DEPOSITS IN THE FREDERICKTOWN AREA, MISSOURI: MISSOURI GEOLOGICAL SURVEY AND WATER RESOURCES REPT. INV. NO. 8 , 25 P.} |