Document jrbKnayq3OLDjdj2GM079KXp

March 10, 1951 Mr. F alp h C. Champ lin Ethyl Corporation 100 Park Avenue New York City 17 Dear Ralph: I send you herewith reprints of three fairly recent articles relating to air analyses and m e t h o d s . The one on the "Collection and Analysis of folids in Urban Atmospheres," is the only publication of any real significance in relation to the questions dealt with in your letter. We have much unpublished information which will appear later. I hope this will help. If I can do anything more at this time or later, let me know. Sincerely yours, : , . , Robert A. Kehoe, M. D. r RAK ef . ' . " , C.C. s Mr. E. X. Locher E n c . : , ' . v . Collection and Analysis of Solids in Urban Atmospheres Spectrographic Determination of Beryllium in Biological Material and in Air ....... '/ .. ' ^ : . Determination of the Oxides of Nitrogen in Air