00325nam a2200121Ia 450000500170000000800410001704100080005808200150006610000150008124500600009626000380015630000090019420260720174539.0260720s2005    xx            000 0 und d  aeng  a500.7 YADT  aYadav, M S  aModern methods of science teaching in secondary schools  aNew DelhibA P H Publishingc2005  a268p