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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) |