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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 800.575.912.250.618.100.400.500 Crocus B01.650.940.800.575.912.250.618. ... Blood Preservation E02.792.833.230.500 Blood Safety E02.792.833.660 Organ Preservation E02.792. ...
  2. pdfNLM Technical Bulletin, no.117-128 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/117-128-1979.pdf
    ... 6021-39-4 BEECHWJCD CREOSOTE 8022-19-3 SAFFRON OIL 8022-22-8 SPIKENARD OIL 6024-14- ... by NIOSH, the National Institute for Occupa- tional Safety and Health. The regenerated file contains toxicity data ...