000 00279nam a22001337a 4500
003 OSt
082 _a375.0083 SIN
100 _aSingh, Uma
245 _aParyavaran Shiksha
250 _a4th ed.
260 _aAgra
_bAgarwal Publication
_c2015
300 _a216p.
942 _2ddc
_cBK
999 _c4055
_d4055