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Subject
- Location9
- Boundaries7
- Inland Waters6
- Natural gas6
- Power resources6
- Transportation6
- Administrative and political divisions5
- Electric utilities4
- Electric power2
- Electric power transmission2
- Natural gas pipeline compressor stations2
- Natural gas pipelines2
- Administrative and Political Boundaries1
- Biodiesel fuels1
- Boundary disputes1
- Cities and towns1
- Climatology, Meteorology and Atmosphere1
- Coal-fired power plants1
- Economy1
- Education1