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  1. By: Harvard University. Gray Herbarium. - Farlow Reference Library and Herbarium. - Harvard University. Botanical Museum. - International Botanical Congress Vienna)
    Publication info: Cambridge.1904.
    Holding Institution: Harvard University Botany Libraries
  2. By: Harvard University. Botanical Museum.
    Publication info: Cambridge, Mass. :Botanical Museum, Harvard University,1932-
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library