00495nam a2200169Ia 450000500170000000800460001703700120006304000210007504100130009608400190010924500490012824500100017725000250018726000820021230000090029465000220030320250508160316.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDL bengcFEDL  aeng2eng  a507, NCEqFEDL 0aTeacher's guide to science is doing: Class 4 0cNCERT  aExperimental edition  aNew Delhi, IndiabNational Council of Educational Research and Trainingc1971  a73p.  aScience education