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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ewell, Marshall D
    Type: Article
    In: Transactions
    Volume: 27
    Date: 1907
    Page Range: 21--23
    Publication Info: Columbus, Ohio [etc.]
  2. By: Ewell, Marshall D
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 46
    Issue: 185
    Date: 1907
    Page Range: 187--190
    Publication Info: Philadelphia, American Philosophical Society,