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I.—North German Neocomian Ammonites. Die Ammonitiden des Norddeutschen Neocom (Valanginien, Hauterivien, Barrêmien, und Aptien). By Professor Dr.A. v. Koenen. pp. 451, 55 plates, and 2 text illustrations. Abhaudluugen der Königlich Preussischen Geologischeu Landesanstalt und Bergakademie, Neue Folge, Heft 24, 1902.
Published online by Cambridge University Press: 01 May 2009
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