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  1. By: Ratzel, Friedrich,
    Publication info: München :R. Oldenbourg,1878-80.
    Holding Institution: University of California Libraries (archive.org)
  2. By: Ratzel, Friedrich,
    Edition: 2. Aufl.
    Publication info: München :R. Oldenbourg,1893.
    Holding Institution: University of California Libraries (archive.org)