Baerends, G.P., 1941.: - Fortpflanzungsverhalten und Orientierung der Grabwespe Ammophila campestris Jur. Proefschrift [...].

Leiden 1941. Oktav, 24.2cm. VIII,208,.V S., 107 Abb., 26 Tab., Bibliogr. Brosch., Orug.-Umschlag. Eine Ecke mit Stissspur, übrigens gut. - Doktorabeit.

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