Subject
- Military intelligence45
- Tribes13
- Gazetteers12
- Military operations11
- Reports9
- Biographies8
- Geographical data8
- Mesopotamian Campaign (1914-1918)8
- First World War (1914-1918)7
- Imperialism7
- Roads7
- Surveys7
- Armed forces6
- Hydrology6
- Telegraph lines6
- Irrigation5
- Military maps5
- Coastal zones4
- Demographic statistics4
- Historical geography4