00356nam a2200145 a 450000100080000000500110000800800410001910000150006024500500007526000230012530000100014865300240015865300190018265300090020111112321997-01-14       1982    bl uuuu      00u1 u    #d1 aKRAL, D.M.  aSoil erosion and conservation in the tropics.  aMadison: ASAc1982  a149p.  aCONSERVACAO DO SOLO  aEROSAO DO SOLO  aSOLO