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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) |