July 17, 1969 PERSONAL AND CONFIDENTIAL Robert T.

May 10, 1965 Dr.

THE UNIVERSITY OF BRITISH COLUMBIA V A N CO U V ER 8, CA N A D A DEPARTMENT OF GEOLOGY Jan u ar y 8, 1961;.

r- ,, J A M E S A.

October 7, 1960 Mr.

ESSO STANDARD ITALIANA SOCIET ' P E R AZIONI S E D E CE N T R ALE IN GE N OVA CAPITALE L 6 006.000.000 INTERAMENTE VERSATO G e n o v a , ii May Via A88AROTTI, 40 T e l e f o n o : 82441-83551 T e l e g r . : ESSO ,9 1<?

Memo to: From: Date: Dr.

i r " v * -**vi*r COUNCIL ON OCCUPATIONAL HEALTH Am er ica n M e d ica l Associa t ion 5 3 5 NORTH DEARBORN STREET CHICAGO tO.

November 18, 1961 Mr.

THRESHOLD LIMIT VALUE FOR TETRAETHYL LEAD (1967) (1968) 0.075 mg/m3 Downward revision?

WAYiiTE STATE UNIVERSITY CO LLEGE O F M EDICINE 1401 RIVARD STR EET DETRO IT 7 .

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MARQUETTE UNIVERSITY SCHOOL OF MEDICINE 561 NORTH FIFTEENTH STREET MILWAUKEE 3, WISCONSIN DEPARTMENT OF OCCUPATIONAL AND ENVIRONMENTAL MEDICINE August 12, 1963 Mr.

PROFESSOR R.A.

April 11, 1963 Dr.