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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. 2016 MeSH Highlights: Questions and Answers 
    https://www.nlm.nih.gov/bsd/disted/clinics/mesh_2016_qa.html
    ... heading is merged with another heading (e.g., Black Pepper was merged with Piper ... for "See Also" references in the MeSH Database record. "See Also" references ...
  3. 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 ...
  4. pdf2016MeshTree.pdf 
    https://www.nlm.nih.gov/mesh/2016/download/2016MeshTree.pdf
    ... 650.940.800.575.100.812.666.500...........................................Piper nigrum B01.650.940.800.575.100.821...........................................Plumbaginaceae ...
  5. pdf2017MeshTreesWithChangesShown.pdf 
    https://www.nlm.nih.gov/.../2017MeshTreesWithChangesShown.pdf
    ... Phytolacca dodecandra Piperaceae Peperomia Piper Kava Piper betle Piper nigrum Plumbaginaceae Poaceae Agropyron Agrostis Andropogon Avena Bambusa Brachiaria ...