References
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Dawson, J. W. (1875): Notes on the plants, collected by Mr. G. M. Dawson, from the Lignite Tertiary Deposits, near the Forty-ninth Parallel. in Dawson, G. M. (ed.): Report on the geology and resources of the region in the vicinity of the Forty-ninth Parallel, from the Lake of the Woods to the Rocky Mountains. Dawsons Brothers, Montreal: pp. 327–331.
Saporta, L. C. J. G. de (1873): Notice sur les plantes fossiles du niveau des lits à Poissons de Cerin. Georg, Lyon, F. Savy, Paris: 60 pp.