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  1. By: Gray, Asa, - Holm, Theodor (Herman Theodor), - Holmes, Oliver Wendell, - Holton, Isaac F. (Isaac Farwell) - Holzinger, J. M. (John Michael), - Hooper, Edward William, - Horsford, Frederick Hinsdale, - Howell, Joseph, - Howell, Thomas, - Humphreys, A. A. - Hunnewell, Horatio Hollis, - Hunt, Thomas Sterry, - Hunter, C.L.,
    Publication info: [1837-1903]
    Holding Institution: Harvard University Botany Libraries
  2. By: Pringle, Cyrus G. (Cyrus Guernsey), - Gray, Asa, - Horsford, Frederick Hinsdale, - Lumholtz, Carl, - Watson, Sereno,
    Publication info: [1876-1905]
    Holding Institution: Harvard University Botany Libraries
  1. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Cyrus Guernsey Pringle letters to Asa Gray
    Date: 1889-08-15
    Publication Info: [1876-1905]
  2. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Cyrus Guernsey Pringle letters to Asa Gray
    Date: 1890-08-18
    Publication Info: [1876-1905]
  3. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Cyrus Guernsey Pringle letters to Asa Gray
    Date: 1889-08-19
    Publication Info: [1876-1905]
  4. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1890-12-10
    Publication Info: [1837-1903]
  5. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1888-12-24
    Publication Info: [1837-1903]
  6. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1890-07-06
    Publication Info: [1837-1903]
  7. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Cyrus Guernsey Pringle letters to Asa Gray
    Date: 1891-06-12
    Publication Info: [1876-1905]
  8. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1890-06-30
    Publication Info: [1837-1903]
  9. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Cyrus Guernsey Pringle letters to Asa Gray
    Date: 1996-05-25
    Publication Info: [1876-1905]
  10. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-10-11
    Publication Info: [1837-1903]
  11. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Cyrus Guernsey Pringle letters to Asa Gray
    Date: 1887-10-15
    Publication Info: [1876-1905]
  12. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Cyrus Guernsey Pringle letters to Asa Gray
    Date: 1889-10-02
    Publication Info: [1876-1905]
  13. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1889-09-25
    Publication Info: [1837-1903]
  14. By: Horsford, Frederick Hinsdale,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1888-09-04
    Publication Info: [1837-1903]