Subject
- River navigation9
- Concessions2
- Euphrates Expedition (1835-1837)2
- Euphrates River--Surveys2
- River surveys2
- Shipping2
- Steamships2
- Tigris River--Surveys2
- Armed forces1
- Civil aircraft1
- Commercial transport1
- Development policy1
- Economic competition1
- Foreign relations1
- Imperialism1
- Income tax1
- Mail steamers1
- Maps1
- Naval affairs1
- Postal services1