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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...
Preliminary geologic map of the Pumpkin Buttes area, Campbell and Johnson Counties, Wyoming, showing location of uranium occurrences
W. N. Sharp, A. M. White
1957, Miscellaneous Field Studies Map 98
The Pumpkin Buttes area comprises about 450 square miles in Campbell and Johnson Counties that includes several prominent buttes known as Pumpkin Buttes.  The area is near the center of the Powder River Basin, a large physiographic unit of prairie and sculptured terrain that occupies approximately 12, 000 square miles...