References
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Freudenthal, T. (1964): Palaeobotany of the Mesophytic I. Palynology of Lower Triassic Rock Salt, Hengelo, The Netherlands. – Acta Botanica Neerlandica 13(2): 209–236.
Brown, R. W. (1962): Paleocene flora of the Rocky Mountains and Great Plains. – Professional Papers, United States Geological Survey 375: 1–119, 69 pls.
Graham, R. (1935): Pennsylvanian flora of Illinois as revealed in coal balls. II. – Botanical Gazette 97(1): 156–168.
Miner, E. L. (1935): Paleobotanical examinations of Cretaceous and Tertiary coals. – The American Midland Naturalist 16(4): 585–625.
Graham, R. (1934): Pennsylvanian flora of Illinois as revealed in coal balls. I. – Botanical Gazette 95(3): 453–476.
Brongniart, A. T. (1828): Prodrome d'une histoire des végétaux fossiles. F. G. Levrault, Paris and Strasbourg: 223 pp.