000 00319nam a2200157Ia 4500
082 _a614.7/Tha
100 _aThakur, D K
526 _dNTB
526 _aPG
366 _f20
942 _cBK
245 _aEnvironmental sanitation
260 _aNew Delhi
_bDiscovery Publ.House
_c2015
300 _a201
546 _aE
999 _c78281
_d78281