000			00419nam a2200145Ia 4500
008			180713s9999 xx 000 0 und d
082			_a363.7 C1
100			_a"Chawla, Shashi "
245		0	_aTextbook of Environmental Studies
260			_aNewdelhi
260			_b Tata Mcgraw
260			_c2012
365			_b100
942			_cBK
999			_c115205 _d115205