00428nam a22001457a 4500 371.33 EXT L-6, P-1 Exton, William 38269 Audiovisual aids to instruction Exton, William New York Mcgraw-Hill Book Company 1947 xiii, 344 p. ; ill.; 0 0 0 371_330000000000000_EXT MCE 379 Exton, William 38269 ddc BK 542910 542910 0 0 ddc 0 0 MCE MCE 2014-02-24 0 371.33 EXT MCE-40710 2014-02-24 2014-02-24 BK