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UNIVERSITY OF CINCINNATI COLLEGE OF MEDICINE DEPARTMENT O F ENVIRONMENTAL HEALTH KETTERING LAFOEATORY EDEN AND EETKESDA AVENUES CINCINNATI, OHIO 4 5 2 1 9 July 9, 1968 'Mr.

a division of RITTER PFAUDLER CORPORATION ROCHESTER, N Y 14603 (716) BE 5-1000 A u g u sti, 1966 Robert A.

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\ IN R E P L Y R E F E R T O UNITED STATES DEPARTMENT O F THE INTERIOR Geologic Division GEOLOGICAL SURVEY FEDERAL CENTER, DENVER 25, COLORADO October 11. 1962 Dr.

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STATE OF CALIFORN IA- H EALTH AN D W ELFARE AGEN CY DEPARTM ENT OF PUBLIC HEALTH Bureau of Occupat ional Healt h 1500 Be v e r l y Boulevard Los An g e l es, Ca l i f o r n i a 90057 RONALD REAGAN , Governor May 25, 1967 Robert A.

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