Subject
- Diplomacy738
- Plague462
- Vaccination431
- Trade (practice)404
- Treaties360
- Slave trade355
- Bilateral relations353
- Cholera334
- Russo-Persian War (1826-1828)280
- Sanitation278
- Second World War (1939-1945)272
- Colonial administration257
- Reports250
- Military intelligence247
- Military operations216
- Marine navigation200
- Frontiers182
- Weather173
- International relations171
- Ships logs165