References
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Archangelsky, S. (1966): New gymnosperms from the Ticó flora, Santa Cruz province, Argentina. – Bulletin of the British Museum (Natural History). Geology. 13(5): 261–295, 8 pls.
Kräusel, R. O. K. & Jain, K. P. (1964): New fossil coniferous woods from the Rajmahal Hills, Bihar, India. – The Palaeobotanist 12(1): 59–67.
Neves, R. (1961): Namurian plant spores from the southern Pennines, England. – Palaeontology 4(2): 247–279.
Obrhel, J. (1957): Nový druh rodu Ilfeldia Remy ze svrchního stefanienu kladenské uhelné pánve. – Sborník Ústředního ústavu gelogického, Oddíl paleontologický 23(1956): 547–556.
Penhallow, D. P. (1902): Notes on Cretaceous and Tertiary plants of Canada. – Proceedings and transactions of the Royal Society of Canada, Ser. 2 8(sec. 4): 31–91.
Caspary, J. X. R. (1882): Neue fossile Pflanzen der blauen Erde, d. h. des Bernsteins, des Schwarzharzes und des Braunharzes. – Schriften der Königlichen Physikalisch-Ökonomischen Gesellschaft zu Königsberg 22(Abt. 1; Sitzungsber.): 22–31.
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.