00302nam a2200109Ia 4500008004100000082002100041100002600062245005000088250000900138260003600147300000900183240913s9999||||xx |||||||||||||| ||und||  aGS    577  AGA/E  aP.S Verma and Agarwal 0aEnvironmental biology : Principles of Ecology  aNULL  bS Chand and CoaNew Delhic1983  a592p