| Reference | {Deposit:: F1 < HEYL, A. V., AGNEW, A. F., LYONS, E. J., AND BEHRE, C. H., JR., 1959, THE GEOLOGY OF THE UPPER MISSISSIPPI VALLEY ZINC-LEAD DISTRICT: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 309, 310 P.}{Deposit:: F2 < GARVIN, P. L., 1983, SULFIDE MINERALIZATION AT MINERAL CREEK MINES, ALLAMAKEE COUNTY, IOWA: PROCEEDINGS OF THE IOWA ACADEMY OF SCIENCE, V. 90, P. 44-49.}{Deposit:: HEYL, A. V., FIELD NOTES} |