00649nam a2200205 a 450000500170000002000150001708200220003210000220005424500700007626000420014630000210018849000370020969000280024670000250027470000230029996400190032299700180034199900170035995200670037620251203090631.0  a047187888X  a630.2745,bD, Low  aLowrance, Richard  aAgricultural Ecosystems: Unifying concepts, Richard Lowrance, eng  aNew York, John-Wiley &Sons., USc1984  ax, 233p.c24 cm.  aA wiley-Interscience Publication  aAgricultural Ecosystems  aStinner, Benjamin R.  aHouse, Garfield J.  bEngcdefg_  a13857 LIBSC C  c14511d14511  00104070aPUbPUd1998-04-09l0o630.2745, D, Lowp13857yBK