Kievan Rus (jan 10, 980 – nov 17, 988)
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http://school.eb.com/levels/middle/assembly/view/195421
"Russia." Britannica School, Encyclopædia Britannica, 1 Nov. 2017. school.eb.com/levels/middle/article/Russia/276819#207572.toc. Accessed 23 Jan. 2018.
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