Document zoOj76L77nmXZenG4pmvqzv3n

October 17, 1975 Dr. Raymond E. Shapiro Epidemiology Unit, HFF-108 Bureau of Poods Department of Health, Education and Welfare Pood and Drug Administration Washington, D. C. 20204 Dear Dr. Shapiro 1 I recently came across an article in Toxicology and Applied Fharmacology which described the marked differences in the biological effects of Aroclor 1016 and Aroclor 1242. In your evaluation of tolerance* levels for PCBs, I thought that you would be interested in this paper. I have attached a copy in the event you had not seen it. I have alao attached a copy of an older report which describes residue lfevela of PCBa in test animals and appears to support the Monsanto study which I had sent to you earlier. I hope these papers are interesting and useful. Sincerely, . 1 WBPpd bcc : Mr. Cliff Tuttle W. B. Papageorge Manager, Product Acceptability Specialty & Process Chemicals /=} r c. h fr^iron He *. If K ; 3? (/ 4 n V ) GSW 019057 STLCOPCB4005601