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Author - title
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| details | Early Permian | India(Bihar) | Tiwari,R.S. et al. Marker assemblage-zones of spores and pollen species through Gondwana Palaeozoic and Mesozoic sequence in India. | 1992 | |
| details | Early Permian | India(West Bengal) | Tiwari,R.S. et al. Marker assemblage-zones of spores and pollen species through Gondwana Palaeozoic and Mesozoic sequence in India. | 1992 |