| 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 < JENNEY, W. P., 1894, LEAD AND ZINC DEPOSITS IN THE MISSISSIPPI VALLEY: AMERICAN INSTITUTE MINING ENGINEERS TRANSACTION, V. 22, P. 17L-225, 642-646}{Deposit:: F3 < LEONARD, A. G., 1897, LEAD AND ZINC DEPOSITS OF IOWA: IOWA GEOLOGICAL SURVEY ANNUAL REPORT, 1896, V. 6, P.614.} |