Subject
- Second World War (1939-1945)45
- Treaties45
- Concessions, Oil, Bahrain37
- Astronomy--Early works to 180034
- Concessions31
- Boundaries30
- Land ownership25
- Pearl industry and trade25
- Slave trade25
- Smuggling25
- Exports24
- Airfields23
- Bilateral relations22
- Civil aviation22
- Date Gardens22
- Geometry--Early works to 180022
- Petroleum industry22
- Air force21
- Astrology--Early works to 180020
- Colonial administration20