Campbell, F.E. And Others Sound-film Projection : Dealing With Installition, Operation & Maintenansce Of Leading Types Of Sound - Projection Equipment And Public Adreaa Systems By. E. Molloy - 2 - London George Newries Ltd. 1946 - viii,232p. Subjects--Topical Terms: C30N915 Dewey Class. No.: C30N915 / H6