Subject
- Political information18
- Raids (Military science)18
- Water supply18
- Airlines17
- Civil unrest17
- Consuls17
- Geographical exploration17
- Intelligence17
- Land17
- Lighthouses17
- Marine navigation17
- Plague17
- Arab Revolt (1916-1918)16
- Battles16
- Borders16
- Geography16
- Military aircraft16
- Muslim pilgrims and pilgrimages16
- Pearl industry and trade16
- Police16