Subject
- Railway lines21
- War propaganda21
- Fees20
- Forts20
- Hospitality20
- Naval bases20
- Prisoners20
- Quarantine20
- Revenue20
- Rulers20
- Telegraphy20
- Travellers20
- Treaty of Friendship, Commerce and Navigation between Great Britain and Muscat (1939)20
- Abduction19
- Air transport19
- Biographies19
- Budgets19
- Etiquette19
- Mediation19
- Oil extraction19