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  1. pdf2018MeShTreeHierarchy.pdf 
    https://www.nlm.nih.gov/mesh/2018/download/2018MeShTreeHierarchy.pdf
    ... 500.490...........................................Guaiac D20.215.721.500.626...........................................Mastic Resin D20.215.721.500.762...........................................Propolis D20. ...
  2. pdf2017MeshTreesWithChangesShown.pdf 
    https://www.nlm.nih.gov/.../2017MeshTreesWithChangesShown.pdf
    ... D20.215.784.844 Tree - heading Frankincense Guaiac Mastic Resin Propolis Turpentine Plant Nectar Plant Preparations Coffee ...