D EP AR TM E N T O F P U BLIC W ELFARE H E ALTH DIVISION J O S.

May 23, 1944 19' Hr.

ETH YL COR P OR ATION Ma n u f a c t u r i n g a n d T r a f f i c D e p a r t m e n t July 14, 1944 PLEA SE ADDRESS REPLY TO CH RYSLER BUILDING 4 0 3 LEXINGTON AVC., NEW TORN I Dr R.

HARVARD SCHOOL OF PUBLIC H EALTH 55 SHATTUCK STREET BOSTON 15, MASSACHUSETTS May 2!

ALLIS-CHALMERS manufact ur ing company Milwaukee 1, Wisconsin December 18, 1944 Ethyl Gasoline Corporation Detroit, Michigan Gentlemen: .

c 0 xU Y E.

August 22, 1944 19 M r .

July 22, 1946 M r .

The El ectric St orage Bat t ery Company ALLEGHENYAVE. and 19TH ST., PHILADELPHIA 32 Exie BATTERIES December 27, 1946 Robert A.

M aterial: Subm itted: Required: U r i n e and b l ood sam pl es By D r .

February 25> 1946 Dr.

C0r Federal Security Agency U.

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lie B.F.

President ' PHILIP DRI NKER HARVARD CH QO k Of PUBLI C H EALTH BOSTON.