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  1. By: Heyer, Gustav
    Publication info: Erlangen, F. Enke, 1856
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Heyer, Gustav
    Publication info: Leipzig, B.G. Teubner, 1871
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  3. By: Heyer, Gustav
    Publication info: Erlangen, F. Enke, 1852
    Holding Institution: University of Toronto - Gerstein Science Information Centre