Document Lpn9DENZd7kpbvgog2B93Lk0X

fc. h *'a /t* / 4`M- Note to Members: O',/--/ Here ere the Proceedings for the'fourth fall meeting of Air Hygiene Foundation. The bulletin contains important information on the medical, engin eering . lcnal, labor and public relations aspects of industrial health. Please help us bring this timely material before all interested executives in your organization. Additional copies axe available to members free of charge. April, 1940 Air Hygiene Foundation, 4400 Fifth Avenue, Pittsburgh, Fa. 'W- 1 I *i i { 0G52S6 L