George Schatunowski, "The Civil War to the Second World War,", chap.1 of The Soviet Air and Rocket Forces, Asher Lee, ed. (New York : Frederick A. Praeger, 1959). Excerpts (2 photocopies of chapter 1 (1 incomplete)).
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Russian Aeronautical Collection, ACC. 2006-0034, National Air and Space Museum, Smithsonian Institution.