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| Coal Ball Peels (33) |
| Coal balls (33) |
| Cones (Botany) (33) |
| Conifers, Fossil (33) |
| Desmoinian North American Stage (Desmoinesian) (33) |
| Geology, Strategraphic--Carboniferous (33) |
| Geology, Stratigraphic--Pennsylvanian (33) |
| Arthopods (28) |
| Cordaites (28) |
| Strobilus (28) |