File:C605-Figure-10.jpg
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Figure 10 Map showing the thickness and mined areas of the Springfield Coal throughout Illinois. After Treworgy et al. (1999)[1]. Straight lines separating polygons are artifacts of mapping protocol in original.
- ↑ Treworgy, C.G., C.P. Korose, C.A. Chenoweth, and D.L. North, 1999, Availability of the Springfield Coal for mining in Illinois: Illinois State Geological Survey, Illinois Minerals 118, 43 p.
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