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| Coal Ball Peels (60) |
| Coal balls (60) |
| Cones (Botany) (60) |
| Conifers, Fossil (60) |
| Cordaites (60) |
| Desmoinian North American Stage (Desmoinesian) (60) |
| Geology, Strategraphic--Carboniferous (60) |
| Geology, Stratigraphic--Pennsylvanian (60) |
| Mature Cone (60) |
| Strobilus (60) |