00280nam a2200097Ia 4500008004100000082001500041100002700056245005700083260003400140300000800174190709s9999    xx            000 0 und d  a371.33 Er4  aErickson, Carlton, W H 0aFundamentals of teaching with audiovisual technology  aNew YorkbMacmillan Co.c1965  a384