Author: Veenstra, H.J., 1963.:
Title: Microscopic studies of boulder clays.
Description: Groningen. 4to. Pp. viii,211, many photos on 13 plates in fold-out booklet at end, 38 figs., maps and tabs. in text, bibliogr., append. Orig. wrappers. - Doctoral thesis. With special reference to the bryozoa (mostly Late Cretaceous) occurring as erratic fossils in the Pleistocene boulder clays of Denmark, NW Germany and the Netherlands.

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