| link
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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 | Devonian | Early Carboniferous | USSR(Urals) | Medvedeva,A.M. Palynological investigation of Petroleum | 1978 |
| details | Devonian | USSR(Urals) | Motovilov,P.I. Studies of plant remains in oil | 1965 |