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WikiPedia: Tây_Hoa_Kỳ http://www.americanwest.com/ http://www.carnet2voyages.com http://www.westernheritagecenter.com/index.html http://xroads.virginia.edu/~Hyper/TURNER/ http://www.archives.gov/research_room/research_top... http://www.bls.gov/ro9 http://www.census.gov/population/www/cen2000/brief... http://id.loc.gov/authorities/subjects/sh85146140 http://memory.loc.gov/ammem/award97/codhtml/hawpho... http://d-nb.info/gnd/4135535-0