Subject
- First World War (1914-1918)48
- Diplomacy38
- International relations32
- Reports29
- Military intelligence25
- Frontiers21
- Loans21
- Military affairs19
- Armed forces18
- Bilateral relations18
- Foreign relations18
- Mesopotamian Campaign (1914-1918)17
- Railways17
- Second World War (1939-1945)17
- Imports16
- Trade (practice)16
- Military operations15
- Roads15
- Expenditure14
- Exports14