Ninth Congress on Irrigation and Drainage : reports for discussion = Neuvieme Congres des Irrigations et du Drainage (Moscow, 1975).

Eitemau Tebyg

• Twelfth International Congress on Irrigation and Drainage : transactions = Douzieme Congres International des Irrigations et du Drainage : comptes-rendus.
  Cyhoeddwyd: (1984)
• Seventh congress on irrigation and drainage : transactions.
  Cyhoeddwyd: (1969)
• Trasactions of the sixth Congress on Irrigation and Drainage /
  Cyhoeddwyd: (1966)
• Eighth congress on irrigation and drainage, Varna-1972 : transactions.
  Cyhoeddwyd: (1972)
• Reports on the Second Congress on Irrigation and Drainage ... 1954 : some notes /
  Cyhoeddwyd: (1955)