Subject
- Military intelligence26
- Military affairs24
- Foreign relations20
- Tribes20
- Slave trade16
- Transport infrastructure15
- Expenditure14
- Boundaries12
- Colonial administration12
- Geography12
- Roads12
- Arms traffic11
- Foreign affairs11
- Internal politics11
- Reports11
- Historic cities10
- Land10
- Portrait photography9
- Trade (practice)9
- Customs administration8