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  1. By: Löns, Hermann,
    Edition: 32. Aufl. --
    Publication info: Leipzig :R. Voigtländer,1919.
    Holding Institution: University of Toronto - Robarts Library
  2. By: Löns, Hermann,
    Publication info: Hannover :F. Gersbach,[1918?]
    Holding Institution: University of Toronto - Gerstein Science Information Centre