00314nam a2200133Ia 4500020001500000082001900015100002100034245003700055260004300092300000900135490002600144500000500170700000500175  a0916468232  a338.1bB878.WL  aBrown, Leater R.  aThe Worldwide loss of croplandb  aWashingtonbWorldwatch Institutec1978  a48p.  aWorldwatch paperv 24  a  a