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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pickering, Edward C
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 45
    Issue: 182
    Date: 1906
    Page Range: 44--53
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Pickering, Edward C
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 51
    Issue: 207
    Date: 1912
    Page Range: 564--567
    Publication Info: Philadelphia, American Philosophical Society,