Subject
- Jurisdiction, Territorial7
- Languages7
- Population density7
- World maps, Physical7
- Petroleum pipelines6
- Petroleum refineries6
- Petroleum shipping terminals5
- Physical geography5
- Diplomatic and consular service, American4
- Index maps4
- Mines and mineral resources4
- Zeitzone4
- Agriculture3
- Ethnic groups3
- Gas pipelines3
- History3
- Indians of Central America3
- Land use, Rural3
- Migration, Internal3
- Natural resources3
