Author: Cramer, F.H.,, 1964.:
Title: Microplankton from three Palaeozoic formations in the province of León (NW-Spain).
Description: Leiden. 4to. Pp. viii,253-361, 18 plates of microphotos, 56 illustr. in text, refs. Orig. wrappers. - Thesis. Pubilshed separately from Leid. Geol. Meded., vol. 30.

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