Die in der Atmosphäre vorhandenen organisirten körperchen, Prüfung der Lehre von der Urzeugung. : Abhandlung Q Science
Genetics and eugenics; a text-book for students of biology and a reference book for animal and plant breeders Q Science
Elements of geometry: containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids: to which are added elements of plane and sphericale trigonometry Q Science
Flora regni Borussici : flora des Königreichs Preussen oder Abbildung und Beschreibung der in Preussen wildwachsenden Pflanzen Q Science
