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Author: Heyl, Allen V. 1918-2008,
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4
Geological Survey (U.S.),
Heyl, Allen V. 1918-2008,
1
Bozion, C. N., 1919-
1
Flint, Arthur E., 1913-
1
Illinois State Geological Survey
1
Illinois State Geological Survey,
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1
Iowa Geological Survey
1
Iowa Geological Survey,
1
Wisconsin Geological and Natural History Survey
1
Wisconsin Geological and Natural History Survey,
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