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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Landolt, Elias,
    Edition: Zweite durchgesehene und verbesserte Auflage.
    Publication info: Zürich, Schulthess, 1872
    Holding Institution: Boston Public Library
  2. By: Landolt, Elias,
    Edition: 4., verb. Aufl.
    Publication info: Zürich, F. Schulthess, 1895
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  3. By: Landolt, Elias,
    Publication info: Zürich, F. Schulthess, 1881
    Holding Institution: University of Toronto - Gerstein Science Information Centre