00991cam a2200253 a 4500 20181210002843.0 771107s1977 fr b i000 0 eng 9231014234 9231016938 (pbk. : v. 2) LC eng LC BD-DhBPA 371.3 UNE 1977 The Economics of new educational media. Paris : Unesco, 1977. 3 v. ; 23 cm. Educational methods and techniques ; 1-3 "Prepared with the assistance of the International Council for Educational Media." Includes bibliographies. v. 1. Present status of research and trends -- v. 2. Cost and effectiveness -- v. 3. Cost and effectiveness overview and synthesis. mizan Educational technology. 48830 Unesco. 48831 International Council for Educational Media. 48832 Educational methods and techniques ; 1-3. 48833 ddc BK 16679 16679 0 ddc 0 0 BPATC BPATC GEN 2018-04-11 0 371.3 UNE 1977 23413 2018-04-11 00:00:00 2018-04-11 BK mizan