Subject
- Astronomy--Early works to 180056
- Second World War (1939-1945)48
- Treaties45
- Slave trade40
- Concessions, Oil, Bahrain39
- Astrology--Early works to 180036
- Concessions32
- Smuggling31
- Boundaries30
- Medicine--Early works to 180030
- Slave emancipation30
- Bilateral relations29
- Exports27
- Pearl industry and trade26
- Land ownership25
- Airfields24
- Petroleum industry24
- Civil aviation23
- Colonial administration23
- Customs administration23