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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 | Eocene | Hungary | Potonie,R. et al. Pteridophyte spores of some Eocene Browncoal from Dorog, Hungary | 1933 | |
| original | Miocene | W.Germany(N.Rhine) | Potonie,R. On the microscopy of Browncoal.Tertiary spore and pollen forms: Part 4. | 1931 |