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  1. NLM Classification 2016 Edition Now Available. NLM Technical Bulletin. 2016 May–Jun 
    https://www.nlm.nih.gov/.../mj16/mj16_nlm_classification_2016.html
    ... reflect changes in the MeSH vocabulary. For example: Black Pepper was deleted as a main heading and made a cross reference to Piper nigrum . Day Care was changed to Day Care, Medical . ...
  2. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 940.800.575.912.250.812.666.500 Piper nigrum B01.650.940.800.575.912.250.822 ...