00500nam a2200169 a 450000500170000008200170001710000250003424500460005926000430010530000200014869000210016870000190018996400250020899700180023399900170025195200620026820251203091011.0  a577.076bWRA  aWratten, Stephen, D.  aField and laboratory exercises in ecology  aBaltimorebUniversity Park Pressc1980  ax, 227p, 22 cm.  aEcology-Problems  aFry, Gary, LA.  bENGc100de010fg_  a41286 LIBSC C  c26310d26310  00104070aPUbPUd1998-04-08l0o577.076 WRAp41286yBK