00421nam a2200181Ia 4500003000400000005001700004008004000021040000700061041001200068082001500080100001500095245002600110250000600136260003400142300001300176650003400189700001600223OSt20250707115830.0210210b1989   xxu||||| |||| 00| 0 eng d  cAL  aEnglish  a574.5 VERP  aVerma P S   aPrinciples of ecology  a4  aNDbS. Chand & Co. Ltd.c1989  aviii,591  aEcology Environmental Biology  aAgarwal V K