The early years 9th-11th centuries (882-1069) - Plougin, Vladimir; Bashkov, Gennady; Secara, Claudiu A.; ebrary, Inc. (New York : Algora Pub., 2001)
Includes bibliographical references.
Electronic reproduction.
Keywords: Intelligence service -- Russia -- History; Intelligence service -- Soviet Union -- History; Intelligence service -- Russia (Federation) -- History; Electronic books