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  1. By: Barker, George F. (George Frederick),
    Publication info: Washington?, 1886?
    Holding Institution: University of California Libraries
  2. By: Barker, George F. (George Frederick),
    Publication info: [Washington?], [1886?]
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  1. By: Barker, George F. (George Frederick),
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 14
    Issue: 94
    Date: 1875
    Page Range: 440--445
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Barker, George F. (George Frederick),
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 20
    Issue: 113
    Date: 1883
    Page Range: 656--662
    Publication Info: Philadelphia, American Philosophical Society,
  3. By: Barker, George F. (George Frederick),
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 24
    Issue: 125
    Date: 1887
    Page Range: 166--172
    Publication Info: Philadelphia, American Philosophical Society,
  4. By: Barker, George F. (George Frederick),
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 20
    Issue: 113
    Date: 1883
    Page Range: 649--655
    Publication Info: Philadelphia, American Philosophical Society,
  5. By: Barker, George F. (George Frederick),
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 18
    Issue: 102
    Date: 1878
    Page Range: 103--114
    Publication Info: Philadelphia, American Philosophical Society,