00299nam a2200109Ia 450000500170000000800410001702000180005805000200007610000230009624500340011926000360015320251229182922.0251229s9999    xx            000 0 und d  a9780080408033  aHD 9000.6  .L44  aLe Heron Richard B 0aGlobalozed Agriculture cB Le  aNew Yorkb Pergamon Pressc1993