Canada invokes 1977 treaty with US as dispute over pipeline intensifies - The Guardian

1. Canada invokes 1977 treaty with US as dispute over pipeline intensifies  The Guardian
2. Crude quarrel: Canada invokes treaty to negotiate fate of Line 5 pipeline with US  Global News
3. Michigan Gov. Warns of Potential for ‘Catastrophic Oil Spill’ in Great Lakes After Canada Invokes 1977 Pipeline Treaty  Cleveland Scene
4. Michigan's Tribal Nations Respond to Canada's Move to Invoke 1977 Pipeline Treaty - 9 & 10 News  9&10 News
5. Canada Invokes 1977 Treaty Over Great Lakes Pipeline Repairs  gcaptain.com
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