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Subject
- Geology12
- Outdoor recreation6
- Geology, Structural5
- Administrative and political divisions4
- Roads4
- Automobile driving3
- Gas fields3
- Gas pipelines3
- Oil fields3
- Petroleum pipelines3
- Petroleum refineries3
- Petroleum shipping terminals3
- Wildlife refuges3
- Economic conditions2
- Humanitarian assistance2
- Hydrography2
- Motor vehicles2
- Pollution2
- Sediments (Geology)2
- Social conditions2
