Protohaploxypinus duivenii
- Citations total:
- 3
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| details | Early Guadalupian | Oklahoma | Clapham,W.B. Permian miospores from the Flowerpot Formation of western Oklahoma | 1970 | |
| details | Early Guadalupian | Oklahoma | Clapham,W.B. Nature and paleogeography of Middle Permian floras of Oklahoma from their pollen record | 1970 | |
| details | Scythian | Anisian | Canada(British Columbia) | Clapham,W.B. Permian miospores from the Flowerpot Formation of western Oklahoma | 1970 |