Document o9jV0JOvkxK2e4dXD0pYDj80E

S-oo t **7 Daoaofaar 39, 1970 Mr.' ward ttaphonaoa Ifeiohmon and ftoiMCn lUfhtDMi 9timn 713 Division ftraat Oaagti ftaa 77030 .-V Dur Mr. Stopbansoo i vv * Year latter to Br. Jobs A. Sapp, Jr. lapel ring about hygienic standards fox tha inhalation of aaboatoa dust baa boom roforrod to mm. Br. zapp partlelpataa in tbo Mock of tbo *37 on Acceptable CoacoAtratioas of Oaaaa and Busts of the Aaorloaa ntiseia tinilir< Xastitata (MB!). bltbar MU aor its praOa OMiori, tbo Ttoltad latM of Marie* auadarda laaeitau and laarieaa ftaadaxda Association baa aver raeonaadad as aeoaptabla toecantsetlo* of aaboatoa doat la tba air. A biatory of Bygiaolo ftaadarda for Aaboatoa ia gi laa tbi a paper with that eltla By S. A. loach, Annala of Occupa tional Hygiene, Toltaa 13. 9p 7-19. 1970, copy of attached. la ` [if/9 Z bopo that this will satisfy your aaada. plaasa lat aa kaow* __ Tory truly yours. IONCO ,T . J*m* A ,,omaAli JTM/bjd sloauro Jaaas F. Norgaa Xf VVT J. a 222 DUP 0901678