Convolutispora angulata
- Citations total:
- 1
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| original | Westphalian B | W.Germany(N.Rhine) | Hagemann,H.W. Comparative micropetrographic and sporologic studies of the Zollverein 1-5 Seams from the Middle Essen Beds (Westfal B) of the Ruhrcarbons in reference to correlation of Seams. | 1966 |