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August 4, 1942.

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August pO, 1949 Dp .

In t e r n a t io n a l Sme l t in g a n d Re f in in g Co mp a n y East Chicago, Indiana Pigment Division Mr.

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/ DEPARTMENT OF CHEMISTRY R.

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IN REPLYING, ADDRESS THE PUBLIC HEALTH SERVICE REFER TO: FEDERAL SECURITY AGENCY PUBLIC HEALTH SERVICE Wa s h in g t o n 25, D.

C 0 P I 15 May 1943 Ethyl Corporation Chicago, Illinois Dear Sirs* We need a small sample of lead tetraethyl for our laboratory experiments and analysis.