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  1. Versuch einer natürlichen Eintheilung der Amphibien /
    By: Ritgen, Ferdinand August Marie Franz von,
    Publication info: [S.l. :s.n.],1826.
    Contributed by: University of Illinois Urbana Champaign
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  2. Versuch einer natürlichen Eintheilung der Vögel /
    By: Ritgen, Ferdinand August Marie Franz von,
    Publication info: [S.l. :s.n.],1826.
    Contributed by: University of Illinois Urbana Champaign
    View Book