At: Annals of the South African Museum, 22, 2 By: Du Toit A. L.
journalAt: Beiträge zur Paläontologie von Österreich, 25 By: Wachtler M., van Konijnenburg-van Cittert J. H. A.
journalAt: Palaeobotanist, 33 By: Lakhanpal R. N., Guleria J. S., Awasthi N.
journalAt: Bulletin of the United States National Museum, 1918, 103 By: Berry E. W.
journalAt: Botanical Journal of the Linnean Society, 151, 1 By: Pan A. D., Jacobs B. F., Dransfield S., Baker W. J.
journalAt: Monographs in systematic botany from the Missouri Botanical Garden, 21 By: Manchester S. R.
journalAt: Neues Jahrbuch für Geologie und Paläontologie Monatshefte, 1969, 5 By: Churchill D. M.
journalAt: Johns Hopkins University Studies in Geology, 13 By: Berry E. W.
journalAt: Review of Palaeobotany and Palynology, 98, 3-4 By: Gerrienne P.
journalAt: Transactions of the Royal Society of Edinburgh, 40, 4 (31) By: Kidston R.