Л. Л. Кербер and М. Б. Саукке, "О некоторых спорных взглядах на историю авиации в трудах А. С. Яковлева", Moscow, 1984. Typed manuscript (photocopy)
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Collection Citation:
Russian Aeronautical Collection, ACC. 2006-0034, National Air and Space Museum, Smithsonian Institution.