Author: BÖHMERS Johan Christiaan Assien - :
Title: Bau und Struktur von Schale und Sipho bei Permischen Ammonoidea.
Description: 2. Apeldoorn, Universitas, 1936, in-8°, 125 pp, bibl., 67 ills., 2 pl. h/t with 10 ills., stiff printed wrapper, ex-library stamps. Doctoral thesis in physics (the function of the structure of the nautilus shell is discussed); text in German, Dutch abstract. .

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