Walker, Edward Everett, 1900-1974
Government of the United States
Charles Scribner's Sons, 1943
 Buku Teks
Boyd, Anne Morris
United states government publications
H.W. Wilson, 1949
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Lippincott, Isaac
Economic development of the United States
Appleton Century Croffs, 1933
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The United States of America : a government by the people
The America University, [date of publication not identified]
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The United States government Internet manual.
MD : Bernan Press, 2004
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