Subject
- Second World War (1939-1945)40
- Treaties35
- Concessions, Oil, Bahrain32
- Concessions27
- Boundaries26
- Slave trade25
- Exports24
- Pearl industry and trade24
- Smuggling24
- Airfields23
- Date Gardens22
- Air force21
- Petroleum industry21
- Imports20
- Land ownership20
- Slave emancipation20
- Civil aviation19
- Customs administration19
- Claims17
- Diplomacy17