Author: Stefanoff, B., & Jordanoff, D., 1935.:
Title: Studies upon the Pliocene flora of the Plain of Sofia (Bulgaria). [Sbor. Bulgar. Akad. Nauk, Ser. A, 29.]
Description: Sofia. 4to, 27cm. Pp. 150, many photos on 24 pls., 84 figs. in text, refs. Orig. wrs., uncut.

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