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Subject
- Geology43
- Power resources9
- Natural gas6
- Gas companies4
- Geology, Structural4
- Geomorphology4
- Electric lines2
- Electric power transmission2
- Geology, Stratigraphic2
- Glacial epoch2
- Ice sheets2
- Arctic regions—Discovery and exploration—Maps1
- Canada, Northern—Maps, Physical1
- Canada—Northern——Maps—Physical1
- Coal-fired power plants1
- Electric power-plants1
- Electric utilities1
- Formations (Geology)1
- Franklin Expedition1
- Franklin, John, 1786-1847—Travel1