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  1. By: Gray, Asa, - Holm, Theo. (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: Howell, Thomas,
    Publication info: Arthur, Or.? :T. Howell,1881?
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  3. By: Howell, Thomas,
    Publication info: [Arthur, Ore.],1887.
    Holding Institution: University of California Libraries (archive.org)
  4. By: Howell, Thomas,
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  5. By: Howell, Thomas,
    Publication info: Portland,1903.
    Holding Institution: University Library, University of Illinois Urbana Champaign
  6. By: Howell, Thomas,
    Publication info: Portland, Or. :[s.n.],1897-1903.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  7. By: Howell, Thomas,
    Publication info: Portland, Or. :[s.n.],1903.
    Holding Institution: Multiple institutions
  8. By: Howell, Thomas,
    Publication info: Portland, Or.,1903.
    Holding Institution: Cornell University Library
  9. By: Howell, Thomas,
    Publication info: Portland, Or. :[s.n.],1901.
    Holding Institution: Canadiana.org (archive.org)
  10. By: Howell, Thomas,
    Publication info: Portland, Or. :[s.n.],1900.
    Holding Institution: Canadiana.org (archive.org)
  11. By: Howell, Thomas,
    Publication info: Portland, Or. :[s.n.],1903.
    Holding Institution: Canadiana.org (archive.org)
  12. By: Howell, Thomas,
    Publication info: Portland, Or. :[s.n.],1897.
    Holding Institution: Canadiana.org (archive.org)
  13. By: Rothrock, Joseph T., - Lemmon, J. G. (John Gill), - Palmer, Edward, - Parry, C. C. (Charles Christopher), - Matthews, Washington, - Jones, Marcus E. (Marcus Eugene), - Macoun, John, - Cusick, William C. (William Conklin), - Howell, Joseph, - Howell, Thomas,
    Holding Institution: Harvard University Botany Libraries
  14. By: Howell, Thomas,
    Publication info: Arthur, Oregon :Thomas Howell,1885-1896
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
  15. By: Collins, J. Franklin (James Franklin), - Grout, A. J. - Hadley, Sarah B., - Halsted, Byron D. (Byron David), - Handy, Benjamin Jones, - Handy, Louise Holmes, - Handy, Susan Elizabeth, - Harshberger, John W. (John William), - Hartwell, Marjorie B., - Harvey, F. L. (Francis Leroy), - Hay, G. U. (George Upham), - Haynes, Caroline Coventry, - Heller, Amos Arthur, - Hervey, E. W. (Eliphalet Williams), - Hill, J. Irving, - Hitchcock, A. S. (Albert Spear), - Holden, Isaac - Holzinger, J. M. (John Michael), - Hood, Samuel Clarke, - Hope, Thomas, - Horr, Ella Louise, - Howe, Reginald Heber, Jr., - Howell, Thomas, - Hoxie, Nellie H. M., - Hull, S. E., - Hunt, Ellen G., - Huntington, John Warren, - Husnot, T. (Tranquille),
    Holding Institution: Harvard University Botany Libraries
  16. By: Howell, Thomas, - Gray, Asa,
    Publication info: 1884.
    Holding Institution: Harvard University Botany Libraries
    BHL Collections: BHL Field Notes Project
  1. By: Howell, Thomas,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1891-04-04
    Publication Info: [1837-1903]
  2. By: Howell, Thomas,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1885-07-25
    Publication Info: [1837-1903]
  3. By: Howell, Thomas,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1887-03-28
    Publication Info: [1837-1903]
  4. By: Howell, Thomas,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1885-05-14
    Publication Info: [1837-1903]
  5. By: Howell, Thomas,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1887-11-15
    Publication Info: [1837-1903]
  6. By: Howell, Thomas,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1884-11-25
    Publication Info: [1837-1903]
  7. By: Howell, Thomas,
    Type: Correspondence
    In: Asa Gray correspondence.
    Date: 1887-09-21
    Publication Info: [1837-1903]
  8. By: Howell, Thomas,
    Type: Correspondence
    In: James Franklin Collins correspondence.
    Date: 1896-05-04
  9. By: Howell, Joseph, - Howell, Thomas,
    Type: List
    In: Gray Herbarium miscellaneous plant lists
    Date: 1880
  10. By: Howell, Thomas,
    Type: Article
    In: Botanical gazette.
    Volume: 6
    Issue: 9
    Date: 1881
    Page Range: 267--267
    Publication Info: Hanover, Ind. :[publisher not identified],1876-1991.