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Lua i Stíl Chicago (17ú heag.)ebrary, Inc, agus Ruy A. Teixeira. America's New Swing Region: Changing Politics and Demographics in the Mountain West. Washington, D.C.: Brookings Institution Press, 2012.
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Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.