Subject
- Political affairs34
- Air force21
- Airfields21
- Civil aviation19
- Petroleum industry18
- Reports18
- Oil15
- Concessions14
- Diplomacy14
- Shipping14
- Treaties14
- Visits13
- Bilateral relations11
- 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
- Employment8
- Kings and rulers--Succession8