1.
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Menlo Park, CA : U.S. Geological Survey, 2000.
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2.
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Washington, U.S. Govt. Print. Off., 1972.
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3.
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Bloomington : State of Indiana, Dept. of Natural Resources, Geological Survey, 1976.
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4.
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Champaign, Ill. (615 E. Peabody Dr., Champaign 61820) : Illinois State Geological Survey, 1993.
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5.
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Bloomington, Ind. : State of Indiana, Dept. of Natural Resources, Geological Survey, 1987.
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6.
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Indianapolis, W. B. Burford Print. Co., 1928.
QE661 .C8 |
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7.
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Lexington : Kentucky Geological Survey, University of Kentucky, 1968.
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8.
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Bloomington : State of Indiana, Dept. of Natural Resources, Geological Survey, 1974.
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9.
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Urbana, Illinois State Geological Survey, 1973.
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10.
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