01121cam a2200265 a 450000500170000000800410001702000410005804000260009908200200012524500440014526000280018930000190021749000460023650000870028250400290036950501360039859000100053465000350054471000190057971000560059883000540065494200120070899900170072095201180073720181210002843.0771107s1977    fr       b   i000 0 eng    a9231014234z9231016938 (pbk. : v. 2)  aLCbengcLCdBD-DhBPA  a371.3bUNE 197704aThe Economics of new educational media.  aParis :bUnesco,c1977.  a3 v. ;c23 cm.1 aEducational methods and techniques ;v1-3  a"Prepared with the assistance of the International Council for Educational Media."  aIncludes bibliographies.0 av. 1. Present status of research and trends -- v. 2. Cost and effectiveness -- v. 3. Cost and effectiveness overview and synthesis.  amizan 0aEducational technology.9488302 aUnesco.9488312 aInternational Council for Educational Media.948832 0aEducational methods and techniques ;v1-3.948833  2ddccBK  c16679d16679  102ddc4070aBPATCbBPATCcGENd2018-04-11l0o371.3 UNE 1977p23413r2018-04-11 00:00:00w2018-04-11yBKzmizan