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  1. By: Orr, Robert Thomas - Kenyon, Karl W
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 37
    Series: 4
    Date: 1970
    Page Range: 381--394
    Publication Info: San Francisco California Academy of Sciences
  2. By: Orr, Robert Thomas
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 23
    Series: 4
    Date: 1938
    Page Range: 307--310
    Publication Info: San Francisco California Academy of Sciences
  3. By: Orr, Robert Thomas
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 23
    Series: 4
    Date: 1943
    Page Range: 511--536
    Publication Info: San Francisco California Academy of Sciences
  4. By: Orr, Robert Thomas
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 28
    Series: 4
    Date: 1954
    Page Range: 165--246
    Publication Info: San Francisco California Academy of Sciences
  5. By: Orr, Robert Thomas
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 23
    Series: 4
    Date: 1938
    Page Range: 303--306
    Publication Info: San Francisco California Academy of Sciences
  6. By: Orr, Robert Thomas - Poulter, Thomas C
    Type: Article
    In: Proceedings of the California Academy of Sciences, 4th series
    Volume: 35
    Series: 4
    Date: 1967
    Page Range: 193--226
    Publication Info: San Francisco California Academy of Sciences