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From
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To
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Geolocation
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Author - title
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Year
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| original | Permian | USSR(Kazakh SSR) | Lyuber,A.A. et al. Atlas of microspores and pollen of the Paleozoic of the USSR. | 1941 | |
| details | Permian | USSR(Siberia) | Naumova,S.N. Spores and pollen of coals of the USSR. | 1939 | |
| original | Permian | USSR(WSL) | Lyuber,A.A. Spores and pollen from the Permian coal formations of the USSR. | 1938 |