Subject
- Telegraphy[remove]20
- Indo-European Telegraph Line3
- Armed forces2
- Colonial administration2
- Concessions2
- Foreign relations2
- Imperialism2
- Surveys2
- Telegraph lines2
- Air mail1
- Building leases1
- Central Persia Telegraph Line1
- Civil aviation1
- Customs duty1
- Diplomacy1
- Emergency communication systems1
- Finance1
- International trade1
- Irrigation1
- Loans1