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  1. By: Guisan, Fr. Lud. - Emmert, Ferdinand August Gottfried,
    Publication info: Tubingae, Typis Reisianis, [1819]
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Eels  Electric eel  Gymnotiformes
  2. By: Sachs, Karl, - Du Bois-Reymond, Emil Heinrich, - Fritsch, Gustav,
    Publication info: Leipzig, Veit, 1881
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    Subjects: Electric eel