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DlSCUSSIONAL FlLMSTHIP AND SOUND SLIDEFILM
OPAQUE AND OVERHEAD PROJECTION
15 other sections not shown
Ampro audio-visual aids Avenue Bethlehem Steel Company blackboard Bldg broadcast bulletin board Bureau Calif camera Canadian National Railways Canadian Pacific Railway cardboard Castle Films cellophane Center central sound system charts Chicago Chicago 18 classroom color Company Corp Department of Health developed District Headquarters Recruiting effective Extension Division Extension Service Farm Credit Administration Federal field trip Film Library Film Service filmstrip flannel board flash cards graphs Headquarters Recruiting Station home-made illustrations inches instructional aids instructor Kodachrome Kodak laboratory lens lesson light magnetic manual Manufacturers material models Motion Picture necessary objects opaque projector operation pencil photographs posters prepared presentation problem projection Public Library purchase screen slide projector slides sound slidefilm specific specimens Street student tachistoscope tape teaching aids technique television tion University visual aids Visual Instruction wire Wire Recorder York