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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hagen, Johann G.,
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 20
    Issue: 111
    Date: 1882
    Page Range: 206--223
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Hagen, Johann G.,
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 21
    Issue: 114
    Date: 1883
    Page Range: 93--101
    Publication Info: Philadelphia, American Philosophical Society,