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2.
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Springfield : Department of Mines and Minerals, 1951-
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3.
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4.
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5.
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Champaign, Ill. : Illinois State Geological Survey, 1981.
TN872.I5 A25 no.122 |
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6.
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[Urbana : Illinois State Geological Survey, Reprint Series, 1968]
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7.
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Urbana, State Geological Survey, 1956.
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8.
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Champaign, Ill. : Illinois State Geological Survey, 1994.
TN872.I3 I44 no. 144 |
Map It |
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9.
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10.
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