00311nam a2200121Ia 450000500170000000800410001704100080005808200150006610000170008124500340009826000480013230000090018020260720174542.0260720s2004    xx            000 0 und d  aeng  a540.7 KUMM  aKumar, Sunil  aMethods of teaching chemistry  aNew DelhibDiscovery Publishing Housec2004  a339p