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Plate 1 Map of the southeastern part of the Illinois Basin showing the thickness of the Springfield Coal, channels that affect the coal, and major structural features
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|current||21:03, 17 July 2020||1,761 × 2,300 (1.04 MB)||ILSTRAT|
|18:45, 29 June 2020||1,700 × 2,223 (1.2 MB)||ILSTRAT|
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