Subject
- International law7
- Jurisdiction, Territorial7
- Physical geography7
- World maps, Physical7
- Ethnic groups6
- Petroleum pipelines6
- Petroleum refineries6
- Languages5
- Petroleum5
- Petroleum shipping terminals5
- Religion5
- Diplomatic and consular service, American4
- Index maps4
- Zeitzone4
- Agriculture3
- Gas pipelines3
- History3
- Indians of Central America3
- Land use, Rural3
- Migration, Internal3
