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/ Dr* Alfred Von Fr is ch Vienna,' Austria U Dear Sir I really have to reacted sooner to your lette pies of your papers on lead vention.

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October 21# 1949 .Or.

December 2 , 1935 Dr.

f July 12, 1968 Douglas L.

UNIVERSITY OF CINCINNATI COLLEGE OF MEDICINE DEPARTMENT O F ENVIRONMENTAL HEALTH KETTERING LAFOEATORY EDEN AND EETKESDA AVENUES CINCINNATI, OHIO 4 5 2 1 9 July 9, 1968 'Mr.

SM - 34 Sh el l O il C om pan y I NCORPORATED Mayo B u i l d i n g Tu l s a , Ok l ah o ma July 31, 1941 Dr.

January 7, 19^8 Mr.

February 25, 1L*47 Dr V r.

vf Z.I' October %,. 19^7 Mr.

a division of RITTER PFAUDLER CORPORATION ROCHESTER, N Y 14603 (716) BE 5-1000 A u g u sti, 1966 Robert A.

AMERICAN SMELTING AND REFINING FEDERAL.

I N D U S T R I A L H Y G I E N E F O U N D A T I O N O F A M E R I C A , I N C.

175TH ANNIVERSARY GEORGETOWN UNIVERSITY HOSPITAL 3 8 0 0 RESERVOIR ROAD, N.W.