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Author - title
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| details | Frasnian | USSR(Latvian SSR) | Ozolina,V.R. Spore and pollen assemblages of the Upper Devonian Ogrskiy Suite of Lativia. | 1955 | |
| original | Frasnian | USSR(Russian Platform) | Naumova,S.N. Spore-pollen complexes of the Upper Devonian of the Russian Platform and their significance for stratigraphy | 1953 |