Bacteria in milk. A summary of the present knowledge concerning their source and significance Q Science
Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe Q Science
North American freshwater leeches, exclusive of the Piscicolidae, with a key to all species Q Science
Number and its algebra. Syllabus of lectures on the theory of number and its algebra introductory to a collegiate course in algebra Q Science
Das Pflanzenreich. Regni vegetabilis conspectus. Im Auftrage der Königl. preuss. Akademie der Wissenschaften hrgs. von A. Engler Q Science
