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| Coal Ball Peels (20) |
| Coal balls (20) |
| Cones (Botany) (20) |
| Conifers, Fossil (20) |
| Cordaites (20) |
| Desmoinian North American Stage (Desmoinesian) (20) |
| Geology, Strategraphic--Carboniferous (20) |
| Geology, Stratigraphic--Pennsylvanian (20) |
| Mature Cone (20) |
| Pollen Cone (20) |