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  1. pdfNLM Technical Bulletin, no.129-140 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/129-140-1980.pdf
    ... Congestlve/ETIOLOGY MH - Heart Rate/DRUG EFFECTS MH - Histamine Antagonlsts/PHARMACODYNAMICS MH - Injections, Intravenous MH -Male MH - ... ullraatruct 81 GASTRIC ACID A12.838.307.603 Hydrochloric acid present in gastric juice. only /metab /physiol / ...
  2. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Immunologic G12.300.500 Vaccine Potency G12.350 Histamine Release TREE_NUMBER DESCRIPTOR -------------------------------------------------- -------------------------------------------------- G12.400 HIV Seronegativity ...