000 00257nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aGupta, D.P. Sen
245 0 _aWhat On Earth Is Energy ?
260 _aNCERT
_bNCERT
_c1989
300 _a92p.
942 _cBK
999 _c14022
_d14022