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LAKESIDE HOSPITAL LEONARD C. HANNA HOUSE BASIES AND CHILDRENS HOSPITAL Un i v e r s i t y Ho s p i t a l s OF CLEVELAND 2065 ADELBERT ROAD June 9) 1958 RAINBOW HOSPITAL Ma c d o n a l d h o u s e HOWARD M. HANNA PAVILION Dr . Rober t Khoe Ket t er i ng I nst i t ut e of Toxi col ogy Ci nci nnat i , Ohi o Dear Doct or Kehoe: I am t r yi ng t o assembl e some r epr esent at i ve dat a r egar di ng t he r at i o concent r at i on i n br ai n i n or j_n exper i ment al l ead concent r at i on i n bl ood ani mal s -who have el evat ed bl ood l evel s of t hi s el ement . I am par t i cul ar l y anxi ous t o get r at i os i n young ani mal s or humans and i n adul t s. We ar e sear chi ng t he l i t er at ur e f or t hi s i nf or mat i on, but I t hought t hat you mi ght have r un acr oss dat a of t hi s t ype. May I say, i n cl osi ng, what a pl easur e i t has been t o r ead your most compr ehensi ve chapt er , i n Ti ce* s Medi ci ne, on l ead poi soni ng. Many t hanks, TGB/ bj s T. Geor ge Bi dder , M. D K 0019911