00322nam a2200109Ia 450000500170000000800410001702000220005805000250008010000220010524500630012726000220019020251229184200.0251229s9999    xx            000 0 und d  a978-92-510-3204-6  aSPEC S 494.5 .S95A93  aAnderson, Jock  R 0aRisk analysis in dryland farming systemscJock  R Anderson  aRomeb  FAOc1992