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1Nahollo polling.나홀로 볼링by Putnam, Robert D.“...United States Social conditions 1945-...”
Published 2009
Book -
2Miguk ŭi minjujuŭi /미국의 민주주의 /by Tocqueville, Alexis de, 1805-1859“...United States Social conditions To 1865....”
Published 1997
Book -
3Bŭllu Amerikʻa rŭl chʻajaso ̆ /블루아메리카를 찾아서 :by Hong, Ŭn-tʻaek“...United States Social conditions 1980-...”
Published 2005
Book