Author: KRISTENSEN, I.
Title: Differences in density and growth in a cockle population in the Dutch Wadden Sea.
Description: 1957. Archives Néerlandaises de Zoologie XII-3; pp. 351-453, 26 fig. 3 photoplts. Contains also: Postma, H.: Size frequency distribution of sands in the Dutch Wadden Seas. A study in connection with ecological investigations in a tidal area. pp. 319-349, 24 fig. Orig. wrps. complete issue, very good.

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