April 12, 1965 Professor Harry v, Warren Department of Geology Hie University of British Columbia Vancouver 8, Canada Dear Professor Warren: Please accept my thanks for your letter of March 10 and the material enclosed with it* I am hard pressed for time, especially at this end of the year, and we shall be short-handed until Dr.

March 22, 1967 Katharine R.

June 18, 1964 Mr.

c May 27, 1964 Mr.

ETHYL CORPORATION INTER-OFFICE To D r.

TETRAETHYL LEAD (TEL) . 0.075 mg/ m^(as lead ) - S k in Fxten sive and ca r e fu lly co n t r o lle d m an ufactur in g exp er ien ce has in d ica t e d t h a t a ' le v e l o f 0.075 mg-per cu b ic meter o f a ir (measured as lead ) is a good gu id e lin e fo r an allow ab le a ir con cen tr a tion o f TEL.

December 28, 1965 Dr.

ETHYL CORPORATION lOO PARK AVENUE NEW YORK 17, N.

September 21, 1960 A Christine Einert, M.D.

January 23, 1963 Mr.

Gommittee of the Progressive hf ai r t / e I ndustry R o o m 510-11, 60 E a s t 42n d St r e e t N e w Y o r k ,N e w Y o r k 10017 Mem bers Co mbe Ch em i c a l , I n c .

August 7th,. 1967 Director \ Industrial Hygiene Foundation Mellon Institute 4400 Fifth Avenue .

THE RADCLIFFE INFIRMARY, OXFORD ACCIDENT SERVICE Telephone: OXFORD49891-Extension280 GAH/BWE. 9th October, 1967.

Memo to: Dr.

STRICTLY CONFIDENTIAL BATON ROUGE MEETING ETHYL ACTIVITIES RELATING TO AIR POLLUTION OCTOBER 11, 1962 Baton Rouge M.