00302nam a2200121Ia 450000500170000000800410001704100080005808200160006610000150008224500360009726000380013330000090017120260720174536.0260720s2005    xx            000 0 und d  aeng  a370.78 GUPR  aGupta, S P  aResearch in teaching of science  aNew DelhibA P H Publishingc2005  a260p