00467nam a2200181 a 450000100080000000500110000800800410001910000200006024500710008026000320015130000100018365300110019365300240020465300190022865300110024765300090025870000180026711113591997-03-12       1984    bl uuuu      00u1 u    #d1 aSORRENSON, W.J.  aEconomic implications of conservation practices in Parana, Brazil.  aParana, PR: Iapar/GTZc1984  a221p.  aBRASIL  aCONSERVACAO DO SOLO  aEROSAO DO SOLO  aPARANA  aSOLO1 aMONTOYA, L.J.