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  1. By: Gray, Asa, - Ward, Lester Frank, - Webb, Philip Barker, - Wedgwood, Julia, - Weigel, Felix Oswald, - Weigel, T. O. (Theodor Oswald), - T. O. Weigel (Firm), - B. Westermann & Co.,
    Publication info: [1839-1896]
    Holding Institution: Harvard University Botany Libraries
  2. By: Weigel, T. O. (Theodor Oswald),
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden