00408nam a2200169 a 450000100080000000500110000800800410001910000180006024500350007825000100011326000320012330000150015565300160017065300240018665300190021065300090022910070501997-10-20       1955    bl uuuu      00u1 u    #d1 aBENNETT, H.H.  aElements of soil conservation.  a2.ed.  aNew York: McGraw-Hillc1955  a358p.cil.  aCONSERVACAO  aCONSERVACAO DO SOLO  aEROSAO DO SOLO  aSOLO