000 00276 a2200109 4500
008 190228b xxu||||| |||| 00| 0
100 _aSingh, M.
245 _aEnvironmental study /
_cM. Singh
260 _aNew Delhi
_bDiscovery publication
_c2006
300 _a344p.
942 _2ddc
_cBK
999 _c9429
_d9429