00344nam a2200145 a 450000100080000000500110000800800410001910000170006024500340007725000100011126000320012130000180015365300180017165300090018911018082007-10-15       1955    bl uuuu      00u1 u    #d1 aBENETT, H.H.  aElements of soil conservation  a2.Ed.  aNew York: McGraw-Hillc1955  a358p., ilust.  aConservação  aSolo