Freshwater biology — Audiobooks

by C. (Carl Heinrich) Apstein, Friedrich Borcherding, Stephan Clessin, Paul Kramer, E. Schmidt-Schwedt, Arthur Seligo, Friedrich Zschokke

by F. A. (François Alphonse) Forel, August Gruber, Friedrich Ludwig, W. (Walter) Migula, Ludwig Plate, Julius Vosseler, Wilhelm Weltner