1
出版: c2006.
Superior document: The future of American democracy
2
出版: c2003.
3
出版: c2006.
Superior document: Pew Forum dialogue series on religion and public life
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4
出版: c2003.
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5
出版: c2010.
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6
出版: 2007.
Superior document: The Alexis de Tocqueville lectures on American politics
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