> Multivolume work
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1:
Empires at war 1 From Sumer to the Persian Empire Richard A. Gabriel
Westport, Conn. [u.a.]: Greenwood Press, 20XX-
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2:
Empires at war 2 From Carthage to the Normans Richard A. Gabriel
Westport, Conn. [u.a.]: Greenwood Press, 20XX-
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3:
Empires at war 3 From the Medieval Realm to the Ottoman Empire Richard A. Gabriel
Westport, Conn. [u.a.]: Greenwood Press, 20XX-