Harlow, Ralph Volney, author
The United States
Holt, Rinehart and Wiston, 1961
 Buku Teks
United states
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Fincher, E. B., author
The President of the United States
Abelard-Schuman, 1955
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Conservation in the United States
by A. F. Gustafson [and others]
Comstock Publishing Associates, 1961
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Myers, Gustavus, author
History of bigotry in the United States
Random House, 1943
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