00433nam a22001817a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001400102100002100116245002600137260004100163300003100204650001600235CHAP20220329134658.0971013s1979            r     00010     d  a24104  a25076  a29176  cCHAP  a574.5bB700aBrewer, Richard.  aPrinciples of ecology  aPhiladelphia, Pa. :bSaunders,c1979  a299 p.b: ilus. ; gráfs.14aEcología.