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International Pipelines: Canada-United States

For more than a quarter century, large-diameter pipeline systems have been crossing and recrossing the international boundary between Canada and the United States as though that political demarcation line did not exist. Over the years these pipelines have carried large volumes of Canadian oil and gas to American markets and two of them, Interprovincial Pipe Line Limited in the case of oil, and TransCanada PipeLines Limited in the case of natural gas, have also moved Canadian source oil and gas through the United States to reach markets in eastern Canada.