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  1. By: Herschel, John
    Type: Correspondence
    In: Asa Gray correspondence. Senders He-Hi
    Date: 1846-1891
    Publication Info: [1846-1891]
  2. By: Herschel, John
    Type: Correspondence
    In: Asa Gray correspondence. Senders He-Hi
    Date: 1874-01-31
    Publication Info: [1846-1891]