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  1. pdfNLM Technical Bulletin, no.33-44 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/33-44-1972.pdf
    ... GRANULOMA, LETHAL MIDLINE (C5) GRANULOMA, REPARATIVE GIANT CELL HALITOSIS HEMORRHAGE, ORAL ... El CEPHALOMETRY (E5, E6) DIAGNOSIS, ORAL (E6) RADIOGRAPHY, DENTAL (E6)-EXPLODE El.85. ...
  2. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 888.821.414 Gagging C23.888.821.475 Halitosis C23.888.821.525 Heartburn C23.888.821. ... 080 Vomiting, Anticipatory C23.888.852 Signs and Symptoms, Respiratory C23.888.852.040 Epistaxis C23.888. ...