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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 York1900
    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.
    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: Killip, Ellsworth P. (Ellsworth Paine), - Smith, Albert Charles - Wilson, Percy, - Gleason, H A - Britton, Nathaniel Lord, - Rydberg, Per Axel, - Barnhart, John Hendley,
    Type: List
    In: Plant lists : Colombia, Chile, Peru, and Brazil
    Date: 1926-1927
  2. 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-
  3. 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.