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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 840.109 Amber D05.750.078.840.219 Balsams D05.750.078.840.490 Frankincense D05.750. ... 500.109 Amber D20.215.721.500.219 Balsams D20.215.721.500.354 Frankincense D20.215. ...
  2. pdf2016MeshTree.pdf 
    https://www.nlm.nih.gov/mesh/2016/download/2016MeshTree.pdf
    ... 840.109...........................................Amber D05.750.078.840.219...........................................Balsams D05.750.078.840.490...........................................Frankincense D05.750. ...
  3. pdf2017MeshTreesWithChangesShown.pdf 
    https://www.nlm.nih.gov/.../2017MeshTreesWithChangesShown.pdf
    ... Gum Tragacanth Plant Mucilage Polyhydroxyalkanoates Resins, Plant Amber Balsams Frankincense Propolis Reticulin Silk Fibroins Sericins Tannins Hydrolyzable ...