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Geology and zinc-lead deposits in the Catfish Creek area, Dubuque County, Iowa
C. Erwin Brown, Jesse W. Whitlow, Percy Crosby
1957, Miscellaneous Field Studies Map 116
A detailed geologic study was begun in 1951 by the U.S. Geological Survey in cooperation with the Iowa Geological Survey to appraise the potentialities of the Iowa part of the Wisconsin-Illinois-Iowa zinc-lead district for (1) zinc ore in rock strata that contain pitch-and-flat zinc ore bodies elsewhere in the mining...