Megaspore type 21
- Citations total:
- 3
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| original | Westphalian B | Poland | Zerndt,J. Key to the determination of the megaspores of the Upper Carboniferous of Upper Silesia. | 1944 | |
| original | Carboniferous | Poland | Zerndt,J. The Suitableness of megaspores as guide fossils. | 1938 | |
| original | Westphalian | W.Germany | Zerndt,J. The Suitableness of megaspores as guide fossils. | 1938 |