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Vlerk, I.M. van der, & Florschütz, F., 1953.:
The palaeontological basis of the subdivision of the Pleistocene in the Netherlands.
Large 8vo. Pp. 58, 4 pls., 3 figs., 19 diagrs., refs. Orig. wrs.
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Zagwijn, W.H., 1960.:
Aspects of the Pliocene and Early Pleistocene vegetation in the Netherlands.
4to. Pp. 78, 25 microphotos of pollen on 3 pls., 8 figs., 16 large fold. diagrs. in separate folder, refs. Orig. printed wrs.
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