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Author
21
Geological Survey (U.S.)
21
Missouri. Division of Geology and Land Survey
19
Bullock, John H.
14
Kansas Geological Survey
8
Whitney, Helen A.
5
Folger, Helen W.
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5
Illinois State Geological Survey
5
Kentucky Geological Survey
2
Arkansas Geological Commission
2
Chazin, Barbara
2
Erickson, M. S.
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