Contenus

• Die Völkerrechtlichen Verträge Des Sultanats Oman
  Düster, Joachim
• Bibliographie über das Sultanat Oman. Stand Juli 1980
  Düster, Joachim
• The official envelopes of State of Oman and Dhufar from 1967 to 1986: a classification of FDC and other official envelopes, with notes on postal and philatelic usage. Oman Philatelic Studies Occasional Papers
  Düster, Joachim