Subject
- Slave trade14
- Petroleum industry12
- Second World War (1939-1945)11
- Slave emancipation11
- Deportation6
- Homicide6
- Malaria6
- Smuggling6
- Bilateral relations5
- Travel documents5
- Colonial administration4
- Nutrition4
- Passports4
- Visas4
- Birth3
- Concessions, Oil, Bahrain3
- Customs administration3
- Exports3
- Insurrections3
- Labour disputes3