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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Baur, Erwin, - Fischer, Eugen, - Lenz, Fritz,
    Publication info: München, J.F. Lehmann, 1921
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Baur, Erwin, - Lenz, Fritz, - Fischer, Eugen,
    Edition: 2. verm. und verb. Aufl.
    Publication info: München, Lehmann, 1923
    Holding Institution: University of Toronto - Gerstein Science Information Centre