379
U58E
               The Economics of new educational media - Geneva : UNESCO, 1977-82.
               3v (V.p) - Educational methods and techniques .
                Contents: v.1. Present status of research and trends- v.2. Cost and effectiveness- v.3. Cost and effectiveness overview and synthesis

115836
115837
115838
                Subjects: Educational-Costs; Education-Audio-Visual aids; Education-Simultation methods.