The presidency and the political system
Michael Nelson
COP Press, 2000
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the Presidency and the political system / Editor, Michael Nelson
CQ Pres, 2003
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Corwin, Edward S., author
The Presidency today
New York University Press, 1956
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Rossiter, Clinton, 1917-1970, author
The American presidency
The American Library, 1960
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Sayre, Wallace S., author
Voting for President : the electoral college and the American political system / Wallace S. Sayre
Brookings Institution, 1970
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