00655nam a22002057a 4500 BD-DhUL 20160612142839.0 160612s1980 xxk||||| |||| 00| 0 eng d 9231016948 BD-DhUL BD-DhUL 371.335 MUL Unesco. The Multilateral exchange of educational audio-visual materials : existing mechanisms and suggestions for the future / Unesco. Paris : Unesco, 1980. 117 p. ; 24 cm. Educational methods and techniques, 2. Audio-visual materials. Educational exchanges. ddc BK 78009 78009 0 0 ddc 0 371_335000000000000_MUL 0 NFIC 131779 DUL DUL GEN 2016-06-12 purchased 371.335 MUL D16916 2016-06-12 2016-06-12 BK