References
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Berry, E. W. (1930): Revision of the lower Eocene Wilcox flora of the Southeastern States. – Professional Papers, United States Geological Survey 156: 1–196, 50 pls.
Penhallow, D. P. (1908): Report on Tertiary plants of British Columbia collected by Lawrence M. Lambe in 1906 together with a discussion of previously recorded Tertiary floras. Government Printing Bureau, Ottawa: 167 pp.
Saporta, L. C. J. G. de (1890): Revue des travaux de paléontologie végétale parus en 1888 ou dans le cours des années précédentes (Fin). – Revue Générale de Botanique 2: 225–239.
Lesquereux, C. L. (1878): Report on the fossil plants of the auriferous gravel deposits of the Sierra Nevada. – Memoirs of the Museum of Comparative Zoology at Harvard College 6(2): 1–62, 10 pls.
Lesquereux, C. L. (1870): Report on the fossil plants of Illinois. Geological Survey of Illinois: 377–508.
Heer, O. von (1861): Recherches sur le climat et la végétation du pays tertiaire. Jean Wurster & Comp.: 1–220.