Subject
- Air force21
- Airfields16
- Civil aviation11
- Treaties9
- Air services agreements7
- Treaty of Friendship, Commerce and Navigation between Great Britain and Muscat (1939)7
- Homicide6
- Muscat Civil Air Agreement (1934)6
- Tribes6
- Kings and rulers--Succession5
- Labourers5
- Treaty of Friendship, Commerce and Navigation between Great Britain and Muscat (1891)5
- Diplomacy4
- Finance4
- Second World War (1939-1945)4
- Visits4
- Aerial reconnaissance3
- Customs administration3
- Defence3
- Embassies and consulates3