000			00319nam a2200145Ia 4500
008			230523s9999 xx 000 0 und d
082			_a333.7 AST
100			_aAsthana, D.K.
245		0	_aTextbook of Environmental Studies
260			_aDelhi
260			_bS. Chand
260			_c2016
300			_a393
942			_cTB
999			_c1875 _d1875