Subject
- River navigation11
- Colonial administration10
- Mesopotamian Campaign (1914-1918)10
- Biographies8
- Food supply8
- Geographical data8
- Military deployment8
- Political intelligence8
- Telegraph lines8
- Administration7
- First World War (1914-1918)7
- Irrigation7
- Roads7
- Surveys7
- War casualties7
- Armed forces6
- Hydrology6
- Imperialism6
- Malleson Mission (1918-1919)6
- Aeroplanes5