Subject
- Oilfields[remove]14
- First World War (1914-1918)7
- International relations6
- Mesopotamian Campaign (1914-1918)6
- Petroleum industry5
- Second World War (1939-1945)4
- Air raid precautions3
- Petroleum refineries3
- Defence2
- Military demolition2
- Ammunition1
- Anglo-Russian Entente (1907)1
- Diplomacy1
- Geological surveys1
- Harbour and coastal engineering1
- Imperialism1
- Naval bases1
- Oil supply1
- Postal services1
- Rifles1