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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Deficiency C18.654.521.500.133.699.308 Folic Acid Deficiency C18.654.521.500.133.699.418 ... 500 Neopterin D03.633.100.733.631.400 Folic Acid D03.633.100.733.631.400.600 Pteroylpolyglutamic ...
  2. pdfNLM Technical Bulletin, no.129-140 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/129-140-1980.pdf
    ... 534 p ill Proceedings of a symposium 1 Folic Acid Deficiency - congresses2 Fohc Acid - congresses 3 Neurology - congresses ...