Subject
- Air force21
- Airfields21
- Political affairs21
- Civil aviation19
- Petroleum industry18
- Concessions14
- Diplomacy14
- Oil14
- Reports14
- Shipping14
- Treaties13
- Visits13
- Treaty of Friendship, Commerce and Navigation between Great Britain and Muscat (1939)11
- Tribes11
- Air services agreements10
- Embassies and consulates10
- Muscat Civil Air Agreement (1934)9
- Bilateral relations8
- Employment8
- Muscat Civil Air Agreement (1947)8