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2007
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2009
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The University of Chicago
1953
RICHARDS,KENNETH
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1987
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1968
RICHARDS,NORMAN
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CUNNINGHAM,LAWRENCE S.
Holt, Rinehart and Winston
1990
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ROTHROCK,GEORGE A.
Rand Mc Nally & Company
1975
Spencer Press
1955
Loyola University Press
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Time-Life Books
1981
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KAMMER,MICHAEL R.
1963
GRAFF,HENRY F.
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Enciclopedia Britannica
1995
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1994
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RONNETT,ALEXANDER E.
Centrul Cutural Român
World Book International
Wodsworth
William Benton