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  1. pdfNLM Technical Bulletin, no.167-176 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/167-176-1983.pdf
    ... Jeanne C. Goshorn, Specialized Information Services, NLM The ClassificationCode (CC)field in the online Registry of Toxic ... Reference Manual. The user is reminded that the ClassificationCodes are inserted when certain types of data are ...
  2. pdfNLM Technical Bulletin, no.153-164 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/153-164-1982.pdf
    ... PESTICIDE-NO LONGER USED All of the above ClassificationCode field entries are generated by NIOSH from internal ...