WAGNER, R.H. & C. ÁLVAREZ-VáZQUEZ - A redescription of the Stephanian species Callipteridium virginianum (Fontaine & White) comb. nov. and Alethopteris leonensis Wagner, 1964.

2010. Scripta Geologica Spec. Issue 7; pp. 93-139, 2 fig. 12 plts. Orig. extract, stapled, very good.

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