TH E JOURNAL OF INDUSTRIAL H YGIENE AND TOXICOLOGY HARVARD SCHOOL OF PUBLIC H EALTH t,M anaging editors Philip Drinker Margaret S.

May 16, 1967 William T.

William T.

REPRODUCED AT THE NATIONAL ARCHIVES Reprint from N.

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REPRODUCED AT THE NATIONAL ARCHIVES O_G_P_I GEHSRAL MOTORS CHEMICAL OCMPAHI Dayton, Ohio.

Kett er in g la b o r a to r y EDEN AND BETHESDA AVENUEG CINCINNATI, OHIO 4 3 2 IB U N IV ER SIT Y O F CIN CIN N A TI COLLEGE OF MEDICINE DEPARTMENT OF ENVIRONMENTAL HEALTH September 11, 1968 Mr.

January 3, 1966 Dr.

t September 25, 1930 n Harr Dr* Karl Wurth, Instltuta for tha Taehnioal Investigation of Paintara Matarais, Sehlabusoh, Mulheimerstr. 119, Germany. n Dear Doctor Wurth: Allow aa to thank you for tha raprint of your articla which you so kindly sent ma raoantly.

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L I a 1 9370 LEAD INDUSTRIES ASSOCIATION 0 CAST 4 S T S f tT MXW T O I T , H.

YEARBOOK 19 5 5 Volume I of Th ree Volumes METALS AND MINERALS (EXCEPT FUELS) Prepared by the staff of the B U R E A U O F M IN E S D IV ISIO N O F M IN E R A L S C harles W .

4 SJ Esso Research and Engineering Company (FORMERLY STANDARD OIL DEVELOPMENT COMPANY) P .

fa f1 January 4, 1971 Darrel D.