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  1. By: Von Geldern, Charles E.
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 10
    Series: 4
    Date: 1921
    Page Range: 77--117
    Publication Info: San Francisco California Academy of Sciences
  2. By: Von Geldern, Charles E.
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 9
    Series: 4
    Date: 1919
    Page Range: 313--329
    Publication Info: San Francisco California Academy of Sciences