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Subject
- North American Electric Reliability Council5
- Natural gas4
- Power resources4
- Boundaries3
- Countries3
- Electric utilities3
- Gas companies3
- Electric power transmission2
- Administrative and political divisions1
- Bats1
- Biogeography1
- Biology and Ecology1
- Canals1
- City planning1
- Coasts1
- Electric power distribution1
- Holding companies1
- Hydrography1
- Inland Waters1
- International Date Line1