Subject
- Aerial bombardment[remove]5
- Petroleum industry2
- Second World War (1939-1945)2
- Air raid precautions1
- Armistices1
- Borders1
- Civil defence1
- Conference for the Limitation and Reduction of Armaments (1932-1934)1
- Migration1
- Military administration1
- Military aviation1
- Military logistics1
- Military occupation1
- Military supplies1
- Petroleum refineries1
- Raids (Military science)1
- Rebellions1
- Shipping1