XXIX.--On the Characters of the Beds of Clay immediately below the Coal-Seams of South Wales, and on the occurrence of Boulders of Coal in the Pennant Grit of that district
| Main Author: | Logan, W. E. |
|---|---|
| Format: | Article |
| Terbitan: |
, 1842
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| Online Access: |
https://zenodo.org/record/1661681 |