000 00311nam a2200157Ia 4500
100 _aSingh, Y K
080 _a301.3
526 _dNTB
526 _aUG
366 _f20
942 _cBK
245 _aEnviromental science
260 _aNew Age International
_bNew Delhi
_c2017
300 _a310
546 _aE
999 _c53150
_d53150