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  1. By: Gray, Asa, - Lange, Joh., - Langley, S. P. (Samuel Pierpont), - Lawson, George, - Lefroy, J. H. (John Henry), Sir, - Lehmann, Johann Georg Christian, - Leighton, William Allport, - Lenormand, R.,
    Publication info: [1833-1897]
    Holding Institution: Harvard University Botany Libraries
  2. By: Holmes, William Henry, - Dutton, Clarence E. (Clarence Edward), - Hayden, F. V. (Ferdinand Vandeveer), - Langley, S. P. (Samuel Pierpont), - Powell, John Wesley, - Geological and Geographical Survey of the Territories (U.S.) - World's Columbian Exposition Chicago, Ill.)
    Publication info: 1879-1932
    Holding Institution: Smithsonian Libraries and Archives
    BHL Collections: Smithsonian Field Books collection
  3. By: Holmes, William Henry, - Langley, S. P. (Samuel Pierpont), - Powell, John Wesley, - Gilbert, Grove Karl, - Dutton, Clarence E. (Clarence Edward),
    Publication info: 1897-1932
    Holding Institution: Smithsonian Libraries and Archives
    BHL Collections: Smithsonian Field Books collection
  1. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1891-04-13
    Publication Info: [1833-1897]
  2. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-12-01
    Publication Info: [1833-1897]
  3. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1897-12-22
    Publication Info: [1833-1897]
  4. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1886-12-05
    Publication Info: [1833-1897]
  5. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-01-13
    Publication Info: [1833-1897]
  6. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1888-03-03
    Publication Info: [1833-1897]
  7. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1890-05-06
    Publication Info: [1833-1897]
  8. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-11-11
    Publication Info: [1833-1897]
  9. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1888-11-12
    Publication Info: [1833-1897]
  10. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1889-11-21
    Publication Info: [1833-1897]
  11. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-11-29
    Publication Info: [1833-1897]
  12. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-11-03
    Publication Info: [1833-1897]
  13. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-11-30
    Publication Info: [1833-1897]
  14. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-11-04
    Publication Info: [1833-1897]
  15. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-11-04
    Publication Info: [1833-1897]
  16. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1888-11-08
    Publication Info: [1833-1897]
  17. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1891-10-12
    Publication Info: [1833-1897]
  18. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-10-13
    Publication Info: [1833-1897]
  19. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1889-10-18
    Publication Info: [1833-1897]
  20. By: Langley, S. P. (Samuel Pierpont),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1887-10-28
    Publication Info: [1833-1897]