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Author - title
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| original | Cenomanian | USSR(Urals) | Bolkhovitina,N.A. Spore and pollen characteristics of Cretaceous layers in the Central Regions of the USSR. | 1953 | |
| original | Early Hauterivian | USSR | Bolkhovitina,N.A. Spore and pollen characteristics of Cretaceous layers in the Central Regions of the USSR. | 1953 |