Document zbbrYXX3OoebJQ17vj92QjLL3

October 17, 1975 Dr. Raymond E. Shapiro Epidemiology Unit, HFF-108 Bureau of Foods Department of Health, Education and Welfare Food and Drug Administration Washington, D. C. 20204 Dear Dr. Shapiro* I recently came across an article in Toxicology and Applied -->Pharmacology 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 also attached a copy of an older report which describes residue lfevels of PCBs 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, . ( : WBPipd bcc * Mr. Cliff Tuttle W, B. Papageorge Manager, Product Acceptability Specialty li Process Chemicals r c.h !r v: r on Hc I + K ; 3 9 (/<?'>) DSW 018887 STLCOPCB4005431