00360nam a2200109Ia 450000500170000000800410001705000190005810000180007724501040009526000340019965000170023320251229085416.0251229s9999    xx            000 0 und d  aHD 1741 .T3H24  aHazlewood, A. 0aIrrigation economics in poor countries b illustrated by the Usangu plains of TanzaniacA Hazlewood  aOxfordb Pergamon pressc1982  aArid Regions