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Book reviewed in this article:

Bustard, Robert (1972): Sea-Turtles, natural history and conservation (Naturgeschichte und Schutz der Seeschildkröten).

Tesch, Friedrich Wilhelm (1973): Der Aal. Verlag Paul Parey Hamburg.

ed. Pilleri, G. (1971): Investigations on Cetacea (Untersuchungen an Walen), Band III, 2 Teile, Bern.

ed. Pilleri, G. (1972): Untersuchungen an Walen, Band IV.

ed. Pringle, J. W. S. (1972): Biology and the human sciences. The Herbert Spencer Lectures 1970.

Hediger, H. (1972): Ob Tiere träumen?