Circular 530 Channels: Difference between revisions
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Revision as of 09:58, December 14, 2023
| Geologic Disturbances in Illinois Coal Seams | ||||||||||
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| Channels | Split Coal | Rolls | Limestone Bosses | Clay Dikes | White Top | Igneous Dikes | Joints | Coal Balls | Miscellaneous Disturbances | Acknowledgments |