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  1. By: Gayer, Karl, - Mayr, Heinrich.
    Publication info: Berlin, P. Parey, 1903
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Gayer, Karl,
    Publication info: Berlin, P. Parey, 1886
    Holding Institution: University of Toronto - Robarts Library
  3. By: Schlich, William, Sir, - Hess, Richard Alexander, - Gayer, Karl,
    Publication info: London, Bradbury, Agnew, 1906-25
    Holding Institution: Multiple institutions
  4. By: Gayer, Karl,
    Edition: 4., verb. Aufl.
    Publication info: Berlin, P. Parey, 1898
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  5. By: Gayer, Karl,
    Publication info: Berlin, Paul Parey, 1898
    Holding Institution: University of British Columbia Library