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| Coal Ball Peels (106) |
| Coal balls (106) |
| Cones (Botany) (106) |
| Conifers, Fossil (106) |
| Cordaites (106) |
| Desmoinian North American Stage (Desmoinesian) (106) |
| Geology, Strategraphic--Carboniferous (106) |
| Geology, Stratigraphic--Pennsylvanian (106) |
| Arthopods (105) |
| Strobilus (105) |