Document 5kw226vYyxe5LzDXz6eqEQB6J

MAR 1 0 1S7G DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE PUBLIC HEALTH SERVICE ENVIRONMENTAL HEALTH SERVICE March 6, 1970 National Air Pollution Control administration 3914 Virginia Avenue Cincinnati, Ohio 4522 Dr. Elmer P. Wheeler, Manager Environmental Health Medical Department Monsanto Company 800 N. Lindberg Street St. Louis, Missouri 63166 Dear Dr. Wheeler: s' When I came across the enclosed article, I was reminded of our discussions last year about the thermal degradation of chlorinated biphenyls. I thought that this article on similar materials might be of interest, and I as"sending this copy in case you do not have one already. Sincerely yours J. R. Day ? Engineer Analytical Methods Research Section Division of Process Control Engineering DSW 255152 STLCOPCB4060843