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por Curry, B. B.
Champaign, IL : Illinois State Geological Survey, 1997
Champaign, IL : Illinois State Geological Survey, 1997
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por Heigold, Paul C.
Champaign, Ill. (615 E. Peabody Dr., Champaign 61820) : Illinois State Geological Survey, 1990
Champaign, Ill. (615 E. Peabody Dr., Champaign 61820) : Illinois State Geological Survey, 1990
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por Gilkeson, Robert H.
Champaign, Ill. : Illinois State Geological Survey, 1988
Champaign, Ill. : Illinois State Geological Survey, 1988
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