Subject
- Geographical exploration[remove]8
- Arab nationalism1
- Arabia, Southern--Description and travel1
- Climatic data1
- Concessions, Oil, Aden1
- Diaries1
- First World War (1914-1918)1
- Freedom of movement1
- Frontiers1
- Human geography1
- Intelligence1
- Meteorological data1
- Military operations1
- Political information1
- Public opinion1
- Rebellions1
- Surveying1
- Territorial disputes1
- Trade (practice)1
- Travel1