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020 _a9789350515167
082 _a332.6
100 _aTiwari, Vijay Kumar.
245 2 _aA Textbook of Environmental Studies
260 _bHimalaya Publishing House
_c2012
_aNew Delhi
300 _bPaperback
_a432p.
_c24 cm
942 _cBook
999 _c23979
_d23979