Subject
- Military intelligence12
- Tribes10
- Roads7
- Geography6
- International relations5
- Communication routes3
- History3
- Intelligence3
- Piracy3
- Political information3
- Population3
- Trade (practice)3
- Anglo-Persian War (1856-1857)2
- Archive records2
- Armed forces2
- Biographies2
- Concessions2
- Customs duty2
- First World War in Mesopotamia (1914-1918)2
- Foreign relations2