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  1. Correspondence : Clapp (Asahel) and Engelmann (George), 1857.
    By: Clapp, A.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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  2. A synopsis; or, systematic catalogue of the medicinal plants of the United States.
    By: Clapp, A.
    Publication info: Philadelphia,T.K. and P.G. Collins, printers,1852.
    Contributed by: Yale University (archive.org)
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