000 00268nam a22001217a 4500
003 OSt
100 _aSrivastava, D N
245 _aJansankhya Avim Paryavarniya Shiksha
260 _aAgra
_bAggarwal Pub.
_c2013
300 _a248p.
901 _a2239BED
942 _2ddc
_cBK
999 _c37613
_d37613