000 00323nam a2200133Ia 4500
008 220201s2017 xx 000 0 eng d
082 _a628.1
_bCHA
100 _aChawla,Shashi
245 2 _aA textbook of environmental studies
250 _a9th rep.
260 _aDelhi
_bMcgraw Hill
_c2017
300 _aI.8
942 _2ddc
999 _c37796
_d37796