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Author - title
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| original | Tournaisian | Visean | USSR(European) | Lyuber,A.A. et al. Classification and stratigraphic value of spores of some Carboniferous Coal deposits in the USSR. | 1938 |
| details | Visean | USSR(Kazakh SSR) | Lyuber,A.A. et al. Classification and stratigraphic value of spores of some Carboniferous Coal deposits in the USSR. | 1938 |