00495    a2200169   4500020001500000082001700015100002800032245003700060260005800097300002000155650002500175650002800200700002100228700002200249700002600271700002800297  a093573421x  a338.162bSUS  aEdwards, Clive A. eed.  aSustainable agricultural systems  aLowabSoil and Water Conservation Societyc1990g1990  axvi,696p.c23cm  aAgricultural Systems  aSustainable Agriculture  aHouse, Gar eed.  aLal, Rattan eed.  aMadden, Patrick eed.  aMiller, Robert H. eed.