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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 078.139 Chitin D05.750.078.139.500 Chitosan D05.750.078.280 Collagen D05.750.078. ... D09.698.211 Chitin D09.698.211.500 Chitosan D09.698.330 Ficoll D09.698.350 Fructans ...
  2. NLM Classification 2013 Edition . NLM Technical Bulletin. 2013 May–Jun 
    https://www.nlm.nih.gov/pubs/techbull/mj13/mj13_classification.html
    ... Physiological Processes -- QU 375 18 Chemical Safety 19 Chitosan -- QU 83 20 Community Integration 21 Controlled Substances -- ... 675-690 Numerous main index entries and cross references were modified to reflect changes in the MeSH ...