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' (flIPOHl) : ' ESTABLISHED U'b~ ' E. I . d u Po n t d e N e mo u r s & C o mp a n y INCORPORATED . ANTIOCH WORKS MAil., W l.fT .H A P H IC AND 1 XIMILSS ADDKI..S ,. It 1 IC.H7 A D O N I S S . \ DU PONT. XALIK. " i f OR M I H RBI f/'G[ H ( Ai'l > ' .. . ' - J u l y 13 , 1959. 1. D r .. R o b e r t . A , I K e h o e , - T he K e tte r in g L a b o r a to r y , E d e n "S: B e tb e s d a A ires. C i n c i n n a t i 19, O h io . D ear D r. Xehe : ; I n c o n n e c tio n w i t h C a l Fie s e a rc h ' p r o j e c t X -IO ^ A, t h e th o u g h t, o c b u r r e d t o me t h a t s i n c e D r. L. E . C u r t i s :h a s b e en on v a c a t i o n t h e p a s t fe w w e e k s , you m ig h t :n o t h a v e '- g o tte n a c o p y o f o u r u r i n a l y s e s , so I 'm forw arding I t h e re w ith fo r your infbrm atio.p . I t ' " .. :As"'.you- know we h a v e b e e n d o in g , one s p o t sam p le a w eek on each o f e le v e n em p lo y ees o f a cab company. V . ; ' . :. As a m a tte r o f I n t e r e s t I ' d a p p r e c ia te yourpeo.mmen t sgup on.;,the r e l a t i o n s h ip b e tw e e n h i g h r e a d :in g s and .low, v o lu m e sp e c im e n s when us in g th e " a s h i n g u, m ethod (w h ich is th e m ethod we, have u s e d h e r e . ); ; I rd be: much o p lig e d i f you : wouId k in d ly send, me a c o p y o f your, l a b o r a t o r y p r o c e d u r e ( th e H-ash-.- irpg"'eihedl-'in'' detail-.' : V ,' i : ; :: As you. may h a v e r e a d I n th e p a p e r s , San F ra n cisco has been h av in g a heat wave f o r the p a s t, .several''w eeks.,:' and I Im agine th e en v iro n m en tal s tu d ie s on X-lOp A w i l l r e f l e c t t h is c o n d itio n . . , . :. , . : . Our f i f t h (and f i n a l ) , group o f specim ens .w ill b e p r o c e s s e d t h i s w eek and I s h a l l fo rw a rd a, c o p y of t h e i r e s u lt s p t b ' Stipplem ent the e n c lo se d . ., ; W ith p e r s o n a l good w i s h e s , . g r 0003999 EAGr i ene. Very tr u ly y o u rs, jawrence A, G -erlach, M.D*