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  1. 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
    BHL Collections: New York Botanical Garden
  2. 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
    BHL Collections: New York Botanical Garden
  3. By: Willis, Oliver R. (Oliver Rivington),
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
  4. By: Bolton, Robert, - Bolton, Cornelius Winter, - Willis, Oliver R. (Oliver Rivington),
    Publication info: New York,C.F. Roper,1881.
    Holding Institution: Columbia University Libraries (archive.org)
  5. 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
    BHL Collections: New York Botanical Garden
  6. 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 Genealogy Center (archive.org)
  7. 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
  8. 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 (archive.org)
  9. By: Willis, Oliver R. (Oliver Rivington),
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: John Torrey Papers | New York Botanical Garden
  10. By: Willis, Oliver R. (Oliver Rivington),
    Publication info: New York,American Book Co.[c1894]
    Holding Institution: NCSU Libraries (archive.org)
  11. By: Willis, Oliver R. (Oliver Rivington), - Bolton, Robert,
    Publication info: New YorkRoper & Burdge,1880?
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden