| Reference | {Deposit:: F1 < OWEN, D. D., 1844, REPORT OF A GEOLOGICAL EXPEDITION OF A PART OF IOWA, WISCONSIN, AND ILLINOIS IN 1839: U.S. 28TH CONGRESS, FIRST SESSION, SENATE EXECUTIVE DOCUMENT V. 7, NO. 407, 191 P., MAPS.}{Deposit:: F2 < HEYL, A. V., AND WEST, W. S., 1982, OUTLYING MINERAL OCCURRENCES RELATED TO THE UPPER MISSISSIPPI VALLEY MINERAL DISTRICT, WISCONSIN, IOWA, ILLINOIS, AND MINNESOTA: ECONOMIC GEOLOGY, V. 77, P. 1803-1817.}{Deposit:: HEYL, A. V., FIELD NOTES} |