Subject
- Second World War (1939-1945)154
- Petroleum industry90
- Reports84
- Colonial administration75
- Imports71
- Exports65
- Slave trade64
- Boundary disputes62
- Treaties61
- Shipping54
- Concessions53
- Concessions, Oil, Bahrain48
- Boundaries42
- Diplomacy42
- Pearl industry and trade40
- Smuggling40
- Trade (practice)38
- Bilateral relations37
- Civil aviation37
- Airfields36