7. September 21, 195h =~2- Mr. H. F. Morgenthaler Beryllium and beryllium compounds should not be used by uninstructed or unsupervised groups in any operation that will produce atmospheric contamination (dusts, fumes, mists, etce)e Sincerely yours, Roy E. Albert, KM. De Assistant to Chief (Industrial Health) Medical Branch Division of Biology and Medicine OFFICE p> sumwane » _Me dical ween ene eee _ {82 wane nee nee eee [ennee nee nn ne ef eee eee eee eee MEDICINE,HEALINGSAFE DATE > AUS ve neeeee ee ween ence nnnee- |oe---eForm AEC-318 (Rev. 9-83) U, S. GOVERNMENT PRINTING OFFICE 16--62761-3 - DO® ARCHIVES