Author: Doctorowicz-Hrebenicka, J., 1957.:
Title: Index pollen spectra of Pliocene coal-bearing sediments.
Description: Prace Inst. Geol. Warszawa, 15: pp. 87-165, numerous microphotos and drawings on 27 pls., 2 tabs., refs. 4to. Wrs. - In Polish with English and Russian summaries.

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