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: Mededelingen Nederlands Instituut voor Toegepaste Geowetenschappen TNO, 58 By: Liu Y.-S., Zetter R., Ferguson D. K.
journalAt: Historical biology, 15, 3 By: Poinar G. O.
journalAt: Bulletin of the Torrey Botanical Club, 96, 3 By: Eyde R. H., Bartlett H. H., Barghoorn E. S.
journalAt: Svensk Botanisk Tidskrift, 39, 3 By: Selling O. H.
journalAt: Publication of the Centre of Advanced Study in Geology, Panjab University, 3 By: Lakhanpal R. N.
journalAt: Bulletin of the Torrey Botanical Club, 21, 6 By: Hollick A.
journalAt: Canadian Journal of Botany, 68, 7 By: McIver E. E., Basinger J. F.