Yevgraf Kruten (29 December 1890-19 June 1917) was a member of the Imperial Russian Air Service between 1908-1917, and, he shared his new-found knowledge in a flurry of booklets
Yevgraf Kruten (29 December 1890-19 June 1917) was a member of the Imperial Russian Air Service between 1908-1917, and, he shared his new-found knowledge in a flurry of booklets