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United States. EIS Task Force: Alaska natural gas transportation system : draft environmental impact statement, June 1975 (U.S. Dept. of the Interior :, 1975) (page images at HathiTrust; US access only) United States. EIS Task Force: Alaska natural gas transportation system : final environmental impact statement, March 1976 (The Department : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976), also by United States Dept. of the Interior (page images at HathiTrust) United States. EIS Task Force: Official file of comments received on Alaska Natural Gas Transportation System draft environmental impact statement. (U.S. Bureau of Land Management, 1976) (page images at HathiTrust)