File:C605-Figure-47.jpg
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Figure 47 Map showing the thickness of the Murphysboro Coal near the Oraville channel in Jackson and Perry Counties, southwestern Illinois. From Jacobson (1983)[1]
- ↑ Jacobson, R.J., 1983, Murphysboro Coal, Jackson and Perry Counties: Resources with low to medium sulfur potential: Illinois State Geological Survey, Illinois Mineral Notes 85, 19 p.
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