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  1. By: Cragin, Francis Whittemore,
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  1. By: Cragin, Francis Whittemore,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1891-04-07
    Publication info: [1826-1891]
  2. By: Cragin, Francis Whittemore,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1889-06-24
    Publication info: [1826-1891]