Ferguson, John H.
The American system of government
McGraw-Hill, 1981
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Ferguson, John H.
The American system of government
McGraw-Hill, 1965
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Griffith, Ernest
The American System of Government / Ernest S. Griffith
Frederick A. Praeger, 1954
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OConnor, Karen
American government
Addison Wesley Longman, 2001
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Welch, Susan
American government
Thomson, 2006
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