Subject
- Diplomacy150
- First World War (1914-1918)127
- Treaties109
- International relations105
- Second World War (1939-1945)100
- Bilateral relations91
- Consular services91
- Colonial administration90
- Diplomatic service86
- Frontiers80
- Reports76
- British63
- Concessions58
- Railways55
- Civil aviation53
- Boundaries50
- Expenditure50
- Military intelligence50
- Foreign relations49
- Mesopotamian Campaign (1914-1918)46