Subject
- Second World War (1939-1945)12
- Reports8
- Military intelligence6
- Airlines4
- Bilateral relations4
- International relations4
- Diplomacy3
- Petroleum industry3
- Political crises3
- Strikes3
- Subversive activities3
- Treaties3
- Wireless telegraphy3
- Air force2
- Air mail2
- Aircraft2
- Armed forces2
- Civil aviation2
- Consular services2
- Diplomatic service2