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  1. By: Mears, J Ewing - Keen, William W. (William Williams), - Allen, Harrison, - Pepper, William
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 12
    Issue: 81
    Date: 1871
    Page Range: 19--36
    Publication Info: Philadelphia, American Philosophical Society,