000 00252nam a2200109Ia 4500
008 240421s9999 xx 000 0 und d
100 _aSingh, S.K.
245 0 _aEnvironmental Studies
260 _aDelhi
_bBharati
_c2010
300 _a249p.
942 _cBK
999 _c14746
_d14746