Советская Военная Энциклоредия (Moscow: Voennoe Izdatl'stvo, 1977), s.v. "Казаков Михаил Ильич" and "Казанская Операция 1918", Vol.4, p.28. (photocopy)
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Collection Citation:
Russian Aeronautical Collection, ACC. 2006-0034, National Air and Space Museum, Smithsonian Institution.