00305nam a2200121Ia 450000500170000000800410001704100080005808200150006610000240008124500310010526000380013630000090017420260720174536.0260720s2005    xx            000 0 und d  aeng  a500.7 SINT  aSingh, Yogish Kumar  aTeachingof general science  aNew DelhibA P H Publishingc2005  a313p