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Keystone XL Pipeline examining scientific and environmental issues : hearing before the Subcommittee

United States. Congress. House. Committee on Science, Space, and Technology (2011). Subcommittee on Environment, author.
Washington : U.S. Government Printing Office, 2013. 2013

Keystone XL Pipeline : examining scientific and environmental issues : hearing before the Subcommitt

United States. Congress. House. Committee on Science, Space, and Technology (2011). Subcommittee on Environment, author.
Washington : U.S. Government Printing Office, 2013. 2013

Keystone XL pipeline : the end of the road?

Parfomak, Paul W., author.
[Washington, D.C.] : Congressional Research Service, 2020- 2020