December l6, 10t-l Dr, Degnar 2, iies3 35if Metropolitan Building Denver, Colorado Dear Jao!

Continental Refining Company Artesia, Be*1Mexico Sew York Tulsa December 13, 1941 AIRMAIL - PERSONAL Dear Oscar* We are attaching hereto copy of Cliff Lenington* s report on his activities for the past Teek.

Cin c in n a ti, Ohio June 20, 1955 Dr* 0 B* Willoughby Chemloal Department Experimental Station B* I. duPont do Wamours and Co* Wilmington, Delaware Dear Dr* Willoughby I fool that I owe you an apology for not batring at least acknowledged tha receipt of your letter of January 22nd long before thle* I hare your last letter written May 29th* During the past two weeks I hare been so busy with calculations it was impossible for me to write s suitable answer to your letter* It was very con siderate of you to forward the details of the bismuth separation prior to the publication of your paper* In looking through my file I find that I have lost the only copy of my letter to you dated Jaraxary 7th* If you still have this letter, would it be convenient for you to send mm a copy?

July 3rd, 1963 Dr.

January 28; 1964 Ur.

NATIONAL ACADEMY OFSCIENCES NATIONAL RESEARCHCOUNCIL DIVISION OF CHEMISTRY AND CHEMICAL TECHNOLOGY 2101 ConstitutionAve., Washington, D.

May 2 , 19^0 Mr.

August 2u, 1945 Mr*.

:>ao 'aulo, Kpnx axst , i;o o .

0 ETHYL GASOLINE CORPORATION p y NEW YORK Jan u ar y 28, 1935 Su r ge o n G e n e r a l, Hugh.

(a) To letamino tho magnitudo of the health hazard arising from the use of leaded gasoline for fuel in the flro unit: and secondarily, (Is) To do terraSri tho effective length of iff of tho filter discs'used to remove the load. 77. tor.clesions .p7 I. do -health hazard exixsts frora the breathing of load in air w:.on toe atovo is operated in re cam or oncluauroe under norra&l conditions of ventilation. :.rea.ll amounts of load scape through the ;jrner. a emu11 port Ion of tills Xoiud will be deposited on the surface of cool cooking recoptaeloc while tho remaliiacr will scape into the air.

''o : J r .

iN REPL Y REFER TO , SPM CX OFFICE OWSFeArTvRHIDcEeESPUAoRRfGTSEMuOpENpNlyTGENERAL WASHINGTON C F S/ hb September 5, 194-2 UKDCrienn.titcvReiernorinnbsiaegtrtyitL,AoaOf.bhoKCiroaei.nhtoocreiyn, noaftiA, pplied _ Physiology, Dear Dr.

V" - cet Dr.

G.