Subject
- Concessions, Oil, Muscat5
- Concessions, Oil, Dhofar3
- Concessions2
- Concessions, Oil, Trucial Coast2
- Oil2
- Petroleum industry2
- Resources exploration2
- Aerial photography1
- Civil aviation1
- Coal mining1
- Concessions, Oil, Ajman1
- Concessions, Oil, Oman1
- Frontiers1
- Geographical exploration1
- Geology1
- Military intelligence1
- Mining1
- Travellers1
- Treaties1