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  1. Flora Costaricensis / William Burger, editor.
    By: Burger, William C. - Luteyn, James L., - Wilbur, Robert L. - Field Museum of Natural History.
    Publication info: Chicago, Ill. :Field Museum of Natural History,c2005.
    Contributed by: University of Illinois Urbana Champaign
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  2. The leguminous plants of North Carolina.
    By: Wilbur, Robert L.
    Publication info: [Raleigh]North Carolina Agricultural Experiment Station,1963.
    Contributed by: University Library, University of North Carolina at Chapel Hill (archive.org)
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