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March 6, 2015

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In this Dec. 3, 2012, file photo, crews work on construction of the TransCanada Keystone XL Pipeline near County Road 363 and County Road 357, east of Winona, Texas.

The Tyler Morning Telegraph, Sarah A. Miller / AP

In this Dec. 3, 2012, file photo, crews work on construction of the TransCanada Keystone XL Pipeline near County Road 363 and County Road 357, east of Winona, Texas.