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  1. By: Willis, Oliver R. (Oliver Rivington),
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: John Torrey Papers
  2. By: Willis, Oliver R. (Oliver Rivington),
    Publication info: New York, J. W. Schermerhorn & Co, 1874
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  3. By: Willis, Oliver R. (Oliver Rivington),
    Edition: Rev. and enl. ed.
    Publication info: New York, A. S. Barnes & co, [1877]
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  4. By: Willis, Oliver R. (Oliver Rivington), - Bolton, Robert,
    Publication info: New York, Roper & Burdge, 1880?
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  5. By: Willis, Oliver R. (Oliver Rivington),
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  6. By: Bolton, Robert, - Bolton, Cornelius Winter, - Willis, Oliver R. (Oliver Rivington),
    Edition: Rev. by the author.
    Publication info: New York, C. F. Roper, 1881
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  7. By: Bolton, Robert, - Bolton, Cornelius Winter, - Willis, Oliver R. (Oliver Rivington),
    Publication info: New York, C.F. Roper, 1881
    Holding Institution: Columbia University Libraries
  8. By: Bolton, Robert, - Bolton, Cornelius Winter, - Willis, Oliver R. (Oliver Rivington),
    Publication info: New York, C. F. Roper, 1881
    Holding Institution: Allen County Public Library
  9. By: Wood, Alphonso, - Willis, Oliver R. (Oliver Rivington),
    Edition: Rev. ed.
    Publication info: New York, American Book Company, 1889
    Holding Institution: University of California Libraries
  10. By: Wood, Alphonso, - Willis, Oliver R. (Oliver Rivington),
    Edition: [Rev. ed.].
    Publication info: New York, A.S. Barnes & company, c1889
    Holding Institution: Library of Congress
  11. By: Wood, Alphonso, - Willis, Oliver R. (Oliver Rivington),
    Publication info: New York and Chicago, A. S. Barnes & co, [c1889]
    Holding Institution: Library of Congress
  12. By: Willis, Oliver R. (Oliver Rivington),
    Publication info: New York, American Book Co, [c1894]
    Holding Institution: NCSU Libraries