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  1. 1
    Published 1965
    Serial
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    Saved in:
    Environmental geology notes : Illinois Institute of Natural Resources, State Geological Survey Division.
  2. 2
    Published 1949
    Government Document Serial
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    Saved in:
    Geological Survey circular.
  3. 3
    Published 1998
    Serial
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    Saved in:
    Annual financial report.

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