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  1. By: Clapp, A. (Asahel)
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: John Torrey Papers
  2. By: Clapp, A. (Asahel)
    Publication info: Philadelphia, T.K. and P.G. Collins, printers, 1852
    Holding Institution: Yale Cushing-Whitney Medical Library
  3. By: Clapp, A. (Asahel)
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden