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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 260.300 Hydrobromic Acid D01.029.260.326 Hydrochloric Acid D01.029.260.328 Hydrofluoric Acid D01. ... Chlorates D01.210.375 Cisplatin D01.210.450 Hydrochloric Acid D01.210.450.150 Chlorides D01.210. ...
  2. pdfNLM Technical Bulletin, no.129-140 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/129-140-1980.pdf
    ... ullraatruct 81 GASTRIC ACID A12.838.307.603 Hydrochloric acid present in gastric juice. only /metab /physiol / ... GASTRIC see GASTRIC JUICE 1969-80 to search HYDROCHLORIC ACID, GASTRIC use GASTRIC ACID back through 1981 ...