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  1. Catalogue of plants growing without cultivation in the state of New Jersey, with a specific description of all the species of violet found therein. Directions for collecting ... To which is added a directory of living botanists of North America and the West Indies.
    By: Willis, Oliver R.
    Publication info: New York,J. W. Schermerhorn & Co.,1874.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  2. Catalogue of plants growing without cultivation in the state of New Jersey, with a specific description of all the species of violet found therein. Directions for collecting ... Also, a directory of living botanists of North America and the West Indies.
    By: Willis, Oliver R.
    Edition: Rev. and enl. ed.
    Publication info: Chicago, [etc.]A. S. Barnes & co.[1877]
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  3. Correspondence : Willis (Oliver) and Engelmann (George), 1881.
    By: Willis, Oliver R.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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  4. The history of the several towns, manors, and patents of the county of Westchester, from its first settlement to the present time.
    By: Bolton, Robert, - Bolton, Cornelius Winter, - Willis, Oliver R.
    Publication info: New York,C.F. Roper,1881.
    Contributed by: Columbia University Libraries (archive.org)
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  5. The history of the several towns, manors, and patents of the county of Westchester, from its first settlement to the present time.
    By: Bolton, Robert, - Bolton, Cornelius Winter, - Willis, Oliver R.
    Edition: Rev. by the author.
    Publication info: New York,C. F. Roper,1881.
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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  6. The history of the several towns, manors, and patents of the county of Westchester, from its first settlement to the present time / carefully revised by the author, by Robert Bolton ; edited by C. W. Bolton.
    By: Bolton, Robert, - Bolton, Cornelius Winter, - Willis, Oliver R.
    Publication info: New York :C. F. Roper,1881.
    Contributed by: Allen County Public Library Genealogy Center (archive.org)
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  7. Lessons in the structure, life, and growth of plants, for schools and academies,
    By: Wood, Alphonso, - Willis, Oliver R.
    Edition: [Rev. ed.].
    Publication info: Chicago,A.S. Barnes & company,c1889.
    Contributed by: Library of Congress
    BHL Collections: Library of Congress
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  8. Lessons in the structure, life, and growth of plants, for schools and academies / by Alfonso Wood ; revised and edited by Oliver R. Willis.
    By: Wood, Alphonso, - Willis, Oliver R.
    Edition: Rev. ed.
    Publication info: New York :American Book Company,1889.
    Contributed by: University of California Libraries (archive.org)
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  9. A practical flora for schools and colleges, by Oliver R. Willis.
    By: Willis, Oliver R.
    Publication info: New York,American Book Co.[c1894]
    Contributed by: NCSU Libraries (archive.org)
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  10. Report of the flora of Westchester County. Prepared for Bolton's History of the County.
    By: Willis, Oliver R. - Bolton, Robert,
    Publication info: New YorkRoper & Burdge,1880?
    Contributed by: Mertz Library, The New York Botanical Garden
    BHL Collections: New York Botanical Garden
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