Subject
- Slave trade18
- Petroleum industry17
- Second World War (1939-1945)16
- Slave emancipation13
- Bilateral relations8
- Malaria7
- Piracy7
- Administration6
- Deportation6
- Homicide6
- Smuggling6
- Travel documents6
- Armed forces5
- Customs administration5
- Passports5
- Political reform5
- Trade (practice)5
- Arms control4
- Colonial administration4
- Exports4