00285nam a2200121Ia 450000500170000000800410001704100080005808200150006610000130008124500220009426000380011630000090015420260720174545.0260720s2004    xx            000 0 und d  aeng  a500.7 RAOS  aRao, V K  aScience education  aNew DelhibA P H Publishingc2004  a307p