At: Foss. Pl. Coal Meas. U.S., Pottsville, Printed by B. Bannan By: Lesquereux L. C.
journalAt: Annual Report of the United States Geological Survey, 18, 3 By: Knowlton F. H.
journalAt: Review of Palaeobotany and Palynology, 160, 1-2 By: Li Y.-L., Kvaček Z., Ferguson D. K., Li C.-S., Yang J., Ying T.-S., Ablajev A. G., Liu H.-M.
journalAt: Review of Palaeobotany and Palynology, 111, 1-2 By: Poole I., Cantrill D. J., Hayes P. A., Francis J. E.
journalAt: American Journal of Botany, 99, 8 By: Hermsen E. J., Gandolfo M. A., Zamaloa M. del C.
journalAt: American Journal of Botany, 84, 6 By: Call V. B., Dilcher D. L.
journalAt: American Museum Novitates, 221 By: Berry E. W.
journalAt: Palaeontographica, Abtheilung, B, Paläophytologie, 284, 4–6 By: Kutluk H., Speelman J. D., Hills L. V.
journalAt: Palaeontographica, Abtheilung, B, Paläophytologie, 284, 4-6 By: Dolezych M., Jochmann M., Gröschke A.
journalAt: Norsk geologisk tidsskrift, 12 By: Høeg O. F. A.