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  1. By: Ridgway, Robert
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1883-08-11
    Publication Info: [1837-1895]
  2. By: Ridgway, Robert
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1883-08-16
    Publication Info: [1837-1895]
  3. By: Ridgway, Robert
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1883-08-21
    Publication Info: [1837-1895]
  4. By: Ridgway, Robert
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1880-08-25
    Publication Info: [1837-1895]