File:Figure O-13.jpg
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Fig. O-13 -- Geologic map of the sub-St. Peter surface in northern Illinois.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | ★ Approved revision 14:53, 4 April 2016 | 1,945 × 1,669 (639 KB) | Alan.Myers (talk | contribs) | Fig. O-13 -- Geologic map of the sub-St. Peter surface in northern Illinois. |
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