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Geolocation
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Author - title
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Year
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| original | Carboniferous | Poland | Zerndt,J. Megaspores from the Polish Coal Basin. first Part. | 1934 | |
| original | Paleozoic | USSR(Khakass A.O.) | Ergalskaya,Z. Description of the microscopicalstructure of the coal of the Dvukharshinny Seam, Chernogorski Mines, Minusinsk Basin, Russia. | 1930 |