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  1. pdfChanges made to 2016 MeSH 
    https://www.nlm.nih.gov/mesh/2016/download/TermChange2016.pdf
    ... African Prune D031988 Pygeum Prune, African D031988 Pygeum Prunus africana D031988 Pygeum Pygeum africanum D012107 Research Design Data Quality D012404 Round Ligament ( ...
  2. NLM Digital Collections - Chronological history of plants : man's record of his own existence illustrated through their ... 
    Publication: Boston : Little, Brown and Company, 1879
    resource.nlm.nih.gov/60911110R
    ... lanceolatum, 946. montanum, 1041. muticum, 946. Virginicum, 979. Pygeum acuminatum, 462. Pyramids, 63, gr, 533, 629, 951. ...