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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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| details | Early Gothlandian | USSR(Estonian SSR) | Naumova,S.N. Spores of the Lower Silurian. | 1950 | |
| details | Early Carboniferous | USSR(Urals) | Naumova,S.N. The "Vtorogo Baku" Coal. | 1941 |