At: Publications of the Carnegie Institution of Washington, 599 By: MacGinitie H. D.
journalAt: Bulletin of the United States Geological Survey, 257 By: Knowlton F. H.
journalAt: Quarterly Journal of the Geological Society of London, Part I, 18, 70=2 By: Binney E. W.
journalAt: Pollen et Spores, 10, 2 By: Venkatachala B. S., Kar R. K.
journalAt: Nature, 184, 4701 By: Cranwell L. M.
journalAt: Mededelingen Nederlands Instituut voor Toegepaste Geowetenschappen TNO, 58 By: Liu Y.-S., Zetter R., Ferguson D. K.
journalAt: Proceedings of the Royal Society of Victoria, New Series, 71, 1 By: Cookson I. C.
journalAt: Australian journal of scientific research, Series, B. Biological sciences, 3, 2 By: Cookson I. C.
journalAt: New Zealand Journal of Botany, 10, 3 By: Mildenhall D. C.
journalAt: Historical biology, 15, 3 By: Poinar G. O.