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Ober, Lawrence. “Archduke Leopold Salvator.” E-mail message to Glenn A. Steinberg. January 16, 1998.
O’Connor, John T. Negotiator out of Season: The Career of Wilhelm Egon von Fürstenberg, 1629-1704. Athens: U of Georgia P, 1978.
O’Connor, Raymond G. Diplomacy for Victory: FDR and Unconditional Surrender. New York: Norton, 1971.
Ogrizek, Doré. Germany. The World in Color series. New York: McGraw-Hill, 1956.
O’Neill, Robert J. The German Army and the Nazi Party, 1933-1939. New York: Heineman, 1966.
Orbach, Danny. “The Fight for Freedom: The Story of the German Resistance to Hitler.” Http://www.geocities.com/Athens/Academy/1148/july.html (July 21, 2000).
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d’Orléans, Prince Thibaut, and Princess Marian d’Orléans. A Castle in Bavaria: A Novel. Trans. Helen Weaver. New York: Simon and Schuster, 1977.
Orlow, Dietrich. Weimar Prussia, 1925-1933: The Illusion of Strength. Pittsburgh: U of Pittsburgh P, 1991.
Orton, Lawrence D. The Prague Slav Congress of 1848. New York: East European Quarterly, 1978.
Otabe, E. S. “E. S. Otabe Home Page.” http://www.physik.fu-berlin.de/~otabe/ (July 1, 1998).
Overy, Richard. The Air War, 1939-1945. New York: Stein and Day, 1980.
———. Goering. 1984. Rpt. London: Phoenix, 2000.
———. The Penguin Historical Atlas of the Third Reich. London: Penguin, 1996.
———. Why the Allies Won. New York: Norton, 1995.
Owings, Alison. Frauen: German Women Recall the Third Reich. New Brunswick: Rutgers UP, 1993.