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  1. By: Sachse, Julius F
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 35
    Issue: 151
    Date: 1896
    Page Range: 119--122
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Sachse, Julius F
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 37
    Issue: 157
    Date: 1898
    Page Range: 45--51
    Publication Info: Philadelphia, American Philosophical Society,