00538nam a2200169Ia 450000500170000000800460001703700120006304000200007504100130009508400220010810000210013024500300015126000660018130000150024749000940026254600120035620250508165726.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDLbengcFEDL  aeng2eng  a363.73, NATqFEDL  aNatarajan Chitra 0aResources  : Land and Air  aMumbai, India bHomi Bhaba Centre for Science Educationc1997  aviii, 93p.  aActivity based foundation course on science technology and society : curriculum books - 3  aC.S.E.C