00485nam a2200169Ia 450000500170000000800460001702000180006303700140008104000210009504100130011608400190012924500370014824500280018526000790021330000110029265000120030320250508164336.0008  250505s9999    xx            000 0 eng d  a81-7450-654-3  aReference  aFEDL bengcFEDL  aeng2eng  a500, NCEqFEDL 0aScience : Textbook for class 7th 0cNCERT (New Delhi India)  aNew Delhi, IndiabNational Council Educational Research and Trainingc2006  ax,233p  aScience