Document bBxLEN11qe77Q3mM18yMjwjL6

THE JOHNS HOPKINS UNIVERSITY d e p a r t m e n t o f e pid e m io l o g y SCHOOL OF HYGIENE AND PUBLIC HEALTH 615 North Wolfe Street Baltimore 5, Maryland January 25, 1965 Robert A. K ehoe, M.D. U niversity of C incinnati departm ent o f P rev en tiv e M edicine and In d u s tria l H ealth The K etterin g L aboratory Eden Avenue C i n c i n n a t i , Ohio lj-5219 I' Dear Dr. Kehoe: ' . . . Thank you fo r th e perm ission to use your d a ta . Your p o in t about th e heading is w e ll, and a p p re c ia tiv e ly , ta k e n . I f i t w ere p o s s i b l e we w ould change t h e t i t l e , b u t u n f o rtu n a te ly th e p r in t e r w o n 't l e t us a t t h i s sta g e . Taken l i t e r a l ly , th e re i s no such th in ij as a "norm al" exposure to le a d o r any o th e r to x ic su b stan ce, which I ta k e i t i s an elem ent in your O b je c tio n . "U su a l" o r " a llo w a b le " w ould b e b e t t e r . We w i l l m ark th is fo r c o rre c tio n in th e next e d itio n . Thanks fo r b rin g in g i t Up. - S incerely yours, :PES:af P h i l i p E . S a r t w e l l , M.D. P ro fe sso r o f Epidem iology N 6275