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1960s
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1967
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Illinois State Geological Survey
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The Morton Arboretum Records
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Geological surveys
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Map
Geologic map of Illinois, compiled by H.B. Willman and others
1967
Willman, H. B.
Map
Geologic map of Illinois, compiled by H.B. Willman and others
1967
Willman, H. B.
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