BEACH SANDS.GROGAN RM.1973; IN: EARTH RESOUR.; WASHINGTON, D.C. U.S. INF. AGENCY,1973, P. 277 A 286Book

FLUORITE-ZINC-LEAD DEPOSITS OF THE ILLINOIS-KENTUCKY MINING DISTRICT.GROGAN RM; BRADBURY JC.1968; ORE.DEPOSITS.OF.THE.UNITED.STATES.1933-1967.GRATON-SALES.AIME.NEW-YOR; 1968, VOL. 1, P. 370 A 399Miscellaneous

ORIGIN OF THE STRATIFORM FLUORITE DEPOSITS OF SOUTHERN ILLINOIS.GROGAN RM; BRADBURY JC.1967; ECON. GEOL., MONOGR; USA; 1967, NUM. 0003, P. 40 A 51Miscellaneous