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Author - title
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| details | Late Maestrichtian | Early Paleocene | Wyoming | Bergen,P.F.Van et al. Chemical composition and ultrastructure of fossil and extant Salvinialean microspore Massulae and megaspores | 1993 |
| details | Late Maestrichtian | Early Paleocene | Wyoming | Kedves,M. Tranmission Electron Microscopy of the Fossil Spores. | 1996 |