Nikolai Yegorovich Zhukovsky - Collected Papers. Theoretical Basis of aeronautics.
Nikolai Yegorovich Zhukovsky - Collected Papers. Scanning <a href="//commons.wikimedia.org/wiki/User:Knopik-som" title="User:Knopik-som">Dmitry Makeev</a>, shooting date - 2015 year.
Private collection.