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journalAt: Proceedings and Collections of the Nebraska State Historical Society, Series 2, 2 By: Barbour E. H.
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journalAt: Botanical Gazette, 144, 1 By: Pigg K. B., Rothwell G. W.
journalAt: Palaeontographica, Abtheilung, B, Paläophytologie, 238, 1-3 By: Schweitzer H.-J., Li C.-S.
journalAt: International Journal of Plant Sciences, 161, 1 By: Wang Y.-F., Manchester S. R.
journalAt: Proceedings of the Biological Society of Washington, 19, 22 By: Knowlton F. H.
journalAt: Proceedings of the Biological Society of Washington, 15 By: Knowlton F. H.
journalAt: Review of Palaeobotany and Palynology, 203 By: Wang D.-M., Meng M.-C., Xue J.-Z., Basinger J. F., Guo Y., Liu L.