Online Books by
Konrad Bretscher
Books from the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Bretscher, Konrad: Anleitung zum Bestimmen der Wirbeltiere Mitteleuropas. (A. Raustein, 1904) (page images at HathiTrust)- Bretscher, Konrad: Beobachtungen über Oligochaeten den Schweiz. (1901) (page images at HathiTrust)
- Bretscher, Konrad: Catalogue des inverte bre s de la Suisse (en comm. Georg, 1905), also by Roger de Lessert, Euge ne Pe nard, Theodor Stingelin, Johann Carl, Emile Andre , Gabrielle Montet, Edmond Fre de ric Weber, Maurice Thie baud, Emile Piquet, Otto Fuhrmann, Gaston Mermod, Jean Piaget, and Muse um d'histoire naturelle (Gene ve) (page images at HathiTrust)
- Bretscher, Konrad: Der Vogelzug in Mitteleuropa (Druck der Wagner'schen Universitäts-Buchdruckerei, 1920) (page images at HathiTrust)
- Bretscher, Konrad: Die deszendenztheorie und die sozialen probleme (W. Breitenbach, 1911) (page images at HathiTrust)
- Bretscher, Konrad: Südschweizerische Oligochaeten. (1900) (page images at HathiTrust)
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