Ptychotetraporina
- Citations total:
- 3
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details | Nd | Nd | Naumova,S.N. Spores and pollen of coals of the USSR. | 1939 | |
details | Nd | Nd | Pant,D.D. Suggestions for the classification and nomenclature of fossil spores and pollen grains | 1954 | |
details | Nd | Nd | Potonie,R. Synopsis of the genera of the sporae dispersae. Part 3 | 1960 |