00823   # 2200397  #4500001001000000004000500010005001700015006000300032008000400035010001400039011000500053014000700058019000500065021000500070035000500075041000700080047000500087068000500092082001300097082001100110100000500121110000500126111005500131245000500186245008900191260001500280260000900295260001000304300000500314555000500319650002000324650002000344650002100364650002500385999001500410  aLibros  aC20140826164027.0am  a  aHart, R.D  a  a20  a  a  a  aEn  a  a  aCATIE-SC  a(4061)  a  a  aSeminar on Agricultural Production System Research  a  aAn ecological systems conceptual framework for agricultural research and development  aCosta Rica  c1979  bCATIE  a  a  aAgroecosistemas  aInvestigaciâon  aMarco conceptual  aSistemas agrâicolas  c3797d3797