Report - Colchester Coal Depth - Illinois State Geological Survey...6 5 4 6 3 7 6 2 7 6 6 7 7 7 3 7 6 3 1 7 2 6 4 2 5 6 7 6 4 6 7 1 7 2 6 1 2 2 14 5 3 4 2 6 4 7 1 2 2 6 5 3 4 6 6 3 6 1 8 2

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