1.
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Champaign, Ill. : Illinois State Geological Survey, 1996.
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2.
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Champaign : Illinois State Geological Survey, 1985.
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3.
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Champaign, Ill. (Natural Resources Bldg., 615 E. Peabody Dr. Champaign 61820-6964) : Illinois State Geological Survey, 1993.
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4.
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Champaign, IL : Illinois State Geological Survey, [1992]
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5.
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Champaign, Ill. : Illinois State Geological Survey, 1983.
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6.
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[Champaign, Ill.] : Dept. of Energy and Natural Resources, Illinois State Geological Survey, 1987.
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7.
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Champaign, Ill. : Illinois State Geological Survey, 1981.
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