000 00319nam a2200121Ia 4500
008 240206s2019 xx 000 0 und d
041 _aeng
082 _a621.042/SAW
100 _aSAWNEY G.S
245 _aNON CONVENTIONAL ENERGY RESOURCES
260 _aNEW DELHI
_bPHI LEARNING PVT.LTD
_c2019
300 _aP.B,XI,272
999 _c1148233
_d1148233