00386nam a2200109Ia 4500008004100000082003100041245004600072260007300118300001500191490003500206650003500241140224s9999    xx            000 0 und d  a631.61:631.459(100)(07) H8  aSoil Conservation; an international study  aRomebFood and Agricultural Organization of the United Nationsc1948  aviii,189p.  aFAO Agricultural Studies; no.4  aSoil conservation,Soil erosion