At: Compt. Rendu 4ème Congr. Stratigr. Géol. Carbonif. Heerlen, 1958, Maestricht, Ernest van Aelst, 2 By: Plumstead E. P.
journalAt: Transactions of the American Microscopical Society, 29 By: Bessey C. E.
journalAt: Boletim da Sociedade Broteriana, Ser. 2, 21 By: Reed C. F.
journalAt: Professional Papers / United States Geological Survey, 98, E By: Berry E. W.
journalAt: Professional Papers / United States Geological Survey, 98, F By: Berry E. W.
journalAt: IAWA Journal, 38, 3 By: Woodcock D. W., Meyer H. W., Prado Y.
journalAt: IAWA Journal, 2019, 40, 3 By: Woodcock D. W., Meyer H. W., Prado Y.
journalAt: Publications of the Carnegie Institution of Washington, 590 By: Axelrod D. I.
journalAt: Palaeontological Research, 12, 1 By: Yamada T., Uemura K.
journalAt: American Journal of Botany, 71, 3 By: Wing S. L., Hickey L. J.