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020 _a9789350245781
040 _aUPES LIBRARY
_bEnglish
082 _a628
_bCHA
100 _aChatwal, Gurdeep R
_91459
245 _aTextbook of environmental studies
_b: Environmental science
260 _aNew Delhi:
_bHimalaya,
_c2011
300 _a459p.
650 _aEnvironmental science
700 _aSharma, Harish
_917363
705 _aArora, Madhu
942 _cBK
999 _c10808
_d10808