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Oklahoma Oklahoma City Oklahoma, PennsylvaniaTài liệu tham khảo
WikiPedia: Oklahoma http://www.askmen.com/fashion/travel_top_ten_100/1... http://www.cnn.com/US/OKC/bombing.html http://www.infoplease.com/ipa/A0108355.html http://www.myspiro.com/spiroMounds.asp http://ngeorgia.com/history/nghisttt.html http://www.travelok.com/about/index.asp http://digital.library.okstate.edu/Chronicles/v014... http://ase.tufts.edu/arted/MuseumsOklahoma.htmv http://www.unm.edu/~bber/econ/st-gsp4.htm http://www.bea.gov/newsreleases/regional/spi/2007/...