Fifteenth congress on irrigation and drainage , Hague, Netherlands 1993 vol-1-B /

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• Fifteenth congress on irrigation and drainage , Hague, Netherlands 1993 vol-1-E
  gan: ICID, .
  Cyhoeddwyd: (1993)
• Fifteenth congress on irrigation and drainage , Hague, Netherlands 1993 vol-1-I
  gan: ICID, .
  Cyhoeddwyd: (1993)
• Fifteenth congress on irrigation and drainage,The Hague ,Netherlands vol-2
  Cyhoeddwyd: (1993)
• Fifteenth congress on irrigation and drainage,The Hague ,Netherlands vol-1-J
  Cyhoeddwyd: (1993)
• Fifteenth congress on irrigation and drainage,The Hague ,Netherlands vol-1-H
  Cyhoeddwyd: (1993)