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| Arthopods (2) |
| Birefringence (2) |
| Coal Ball Peels (2) |
| Coal balls (2) |
| Cones (Botany) (2) |
| Conifers, Fossil (2) |
| Cordaites (2) |
| Cross Polarized Light (2) |
| Desmoinian North American Stage (Desmoinesian) (2) |
| Geology, Strategraphic--Carboniferous (2) |