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Author - title
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| details | Late Namurian | Czechoslovakia | DybovЎ-Jachowiczowa,S. Analysis of the spore content changes in Seam No.8 of the Ludvik Shaft in the Petrswalder Mulde (Ostrava Basin) | 1960 | |
| details | Namurian A | Poland | Knafel,S. et al. Megaspores from the Namurian A in the northeastern part of the Upper Silesian Coal Basin, Jowisz Mine. | 1973 |