Die Tier- und Pflanzenwelt des Süsswassers. Erster Band., by Otto Zach 72951 [Full title: Die Tier- und Pflanzenwelt des Süsswassers. Erster Band.] [Full author's name: Otto Zacharias ] [Editor: Otto Zacharias ] [Author: François-Alphonse Forel] [Author: Walter Emil Friedrich August Migula] [Author: Friedrich Ludwig ] [Author: August Gruber ] [Language: German] [Link: https://www.gutenberg.org/7/2/9/5/72951] [Files: 72951-0.txt; 72951-h.htm] Thanks to Peter Becker and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) Regards, Al