000 00253nam a22001097a 4500
003 OSt
100 _aShrivastava, D N
245 _aJansankhya Avam Paryavarniyee Shiksha
260 _aAgra
_bAgarwal Publication
_c2014
300 _a248p.
942 _2ddc
_cBK
999 _c4922
_d4922