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Geolocation
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Author - title
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Year
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| original | Middle Stephanian | France | Alpern,B. Contribution to the palynological and petrographic study of French Coals. | 1959 | |
| original | Stephanian | France(Jura) | Alpern,B. A trial correlation by palynology of the Stephanian Coal Beds cored by four Drillings in the Lons-le-Saunier (Jura) Region. | 1958 |