Author: Wagner, R.H., 1968.:
Title: Upper Westphalian and Stephanian species of Alethopteris from Europe, Asia Minor and North America. [Meded. Geol. Sticht., Ser. C, III-1(6).]
Description: Maastricht. 4to. Vol. 1 (text): pp. 1-188, 55 figs., bibl.., species index; vol. 2 (atlas): pp.189-318, numerous photos on 94 plates. Orig. wrappers.- Issued also as the author's doctoral thesis at the University of Amsterdam.

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