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  1. By: Hildebrand, Friedrich.
    Publication info: Leipzig :Wilhelm Engelmann,1867.
    Holding Institution: Cambridge University Library
    BHL Collections: Charles Darwin's Library
  2. By: Hildebrand, Friedrich.
    Publication info: Leipzig :Wilhelm Engelmann,1873.
    Holding Institution: Cambridge University Library
    BHL Collections: Charles Darwin's Library
  3. By: Darwin, Charles, - Hildebrand, Friedrich.
    Holding Institution: Cambridge University Library
    BHL Collections: Charles Darwin's Library