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  1. By: Gray, Asa, - Kolderup-Rosenvinge, J. L. A. (Janus Lauritz Andreas), - Robb, James, - Robbins, James Watson, - Robeson, Andrew, - Robinson, Benjamin Lincoln, - Robinson, John, - Robinson, W. (William), - Rodgers, John, - Rogers, William Barton, - Rolleston, George, - Rolleston, Grace, - Romanes, George John, - Rood, Ogden N. (Ogden Nicholas), - Röper, Johannes August Christian, - Rose, J. N. (Joseph Nelson), - Rothery, H. C. (Henry Cadogan), - Rothrock, Joseph T., - Roumeguère, Casimir, - Royle, J. Forbes (John Forbes), - Rugel, Ferdinand Ignatius Xavier, - Ruprecht, F. - Rusby, Henry Hurd, - Russell, John Lewis, - Rust, Mary Olivia, - Rydberg, Per Axel,
    Publication info: [1837-1894]
    Holding Institution: Harvard University Botany Libraries
  2. By: Rydberg, Per Axel,
    Publication info: New York, 1900
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  3. By: Rydberg, Per Axel,
    Publication info: New York, 1900
    Holding Institution: University of Toronto - Robarts Library
  4. By: Britton, Nathaniel Lord, - Howe, Marshall A. (Marshall Avery), - Rydberg, Per Axel, - Underwood, Lucien Marcus, - Williams, R. S. (Robert Statham),
    Publication info: New York, 1901
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  5. By: Rydberg, Per Axel,
    Publication info: Fort Collins, Col, Experiment Station, 1906
    Holding Institution: Multiple institutions
  6. By: Rydberg, Per Axel,
    Publication info: Washington, Govt. Print. Off, 1896
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  7. By: Rydberg, Per Axel,
    Publication info: New York, The author, 1917
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
  8. By: Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York, The author, 1922
    Holding Institution: MBLWHOI Library
  9. By: Rydberg, Per Axel,
    Publication info: New York, Rydberg, 1917
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  10. By: Rydberg, Per Axel,
    Edition: 2nd ed. --
    Publication info: New York, The author, 1922
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  11. By: Rydberg, Per Axel,
    Publication info: New York, The author, 1917
    Holding Institution: University of California Libraries (archive.org)
  12. By: Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York, The author, 1922
    Holding Institution: Internet Archive
  13. By: Small, John Kunkel, - Rydberg, Per Axel,
    Publication info: New York, The author, 1903
    Holding Institution: Multiple institutions
  14. By: Small, John Kunkel, - Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York, The author, 1913
    Holding Institution: Multiple institutions
  15. By: Small, John Kunkel, - Rydberg, Per Axel,
    Edition: 2d ed.
    Publication info: New York, The author, 1913
    Holding Institution: Wellesley College Library (archive.org)
  16. By: Rydberg, Per Axel,
    Publication info: New York, 1919
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  17. By: Rydberg, Per Axel,
    Publication info: New York, [c1919]
    Holding Institution: Cornell University Library
  18. By: Rydberg, Per Axel,
    Publication info: [Lancaster, Pa, Press of the New Era Print. Co.], 1898
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  19. By: Rydberg, Per Axel,
    Publication info: [Lancaster, Pa, New Era Printing Co.], 1898
    Holding Institution: Cornell University Library
  20. By: Rydberg, Per Axel,
    Publication info: New York, Torrey Botanical Club, 1896
    Holding Institution: Wellesley College Library (archive.org)
  21. By: Rydberg, Per Axel,
    Publication info: New York, New York Botanical Garden, 1899-1913
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  1. By: Rydberg, Per Axel,
    Type: Article
    In: American journal of botany
    Volume: 10
    Issue: 9
    Date: 1923-11
    Page Range: 485--498
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Killip, Ellsworth P. (Ellsworth Paine), - Smith, Albert C. (Albert Charles), - Wilson, Percy, - Gleason, Henry A. (Henry Allan), - Britton, Nathaniel Lord, - Rydberg, Per Axel, - Barnhart, John Hendley,
    Type: List
    In: Plant lists : Colombia, Chile, Peru, and Brazil
    Date: 1926-1927
  3. By: Rydberg, Per Axel,
    Type: Article
    In: Science
    Volume: 26
    Series: 2
    Date: 1907
    Page Range: 65-71
    Publication Info: New York, N.Y, [s.n.], 1880-
  4. By: Rydberg, Per Axel,
    Type: Article
    In: Memoirs of the Torrey Botanical Club
    Volume: 4
    Issue: 5
    Date: 1896
    Page Range: 297--374
    Publication Info: Durham, N.C, Published for the Club by the Seeman Printery, 1889-
  5. By: Rydberg, Per Axel,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1891-03-14
    Publication Info: [1837-1894]
  6. By: Rydberg, Per Axel,
    Type: Article
    In: Augustana Library publications
    Volume: 6
    Date: 1907
    Page Range: 1-49
    Publication Info: Rock Island, Ill, Augustana College and Theological Seminary, 1898-1981
  7. By: Rydberg, Per Axel,
    Type: Article
    In: Botanical gazette
    Volume: 28
    Issue: 6
    Date: 1899
    Page Range: 423--425
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991