Subject
- Second World War (1939-1945)143
- Reports81
- Petroleum industry78
- Colonial administration71
- Imports69
- Exports62
- Treaties61
- Boundary disputes60
- Shipping53
- Concessions52
- Slave trade50
- Concessions, Oil, Bahrain45
- Boundaries42
- Diplomacy42
- Pearl industry and trade39
- Trade (practice)38
- Civil aviation36
- Airfields35
- Land ownership35
- Political affairs34