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Author - title
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| details | Nd | Nd | Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. | 1995 | |
| details | Nd | Nd | Srivastava,G.K. et al. Megaspores of some Indian species of Isoetes L. and comparable living and fossil forms | 1995 | |
| details | Early Tertiary | Montana | Batten;D.J. et al. Revision of species of Minerisporites, Azolla and associated plant microfossils from deposits of the Upper Palaeocene and Palaeocene/Eocene transition in the Netherlands, Belgium and the USA. | 2001 |