Author: Hofker, J., 1957.:
Title: Foraminifera of the Dutch Hervian.
Description: Meded. Rijks Geol. Dienst, N.S., 10 pp. [ii],19-33, 10 figs. on 1 plate, 1 fold. diagr., 1 sketch map, refs. 4to. Plain new wrappers.

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