Ravenstein, E. G. (1861). The Russians on the Amur: Its discovery, conquest, and colonisation, with a description of the country, its inhabitants, etc., and personal accounts of Russian travellers, productions, and commercial capabilities ... Trübner and co..

Ravenstein, Ernst Georg. The Russians on the Amur: Its Discovery, Conquest, and Colonisation, with a Description of the Country, Its Inhabitants, Etc., and Personal Accounts of Russian Travellers, Productions, and Commercial Capabilities ... Trübner and co., 1861.