A new study by Yaroslav Tynchenko is devoted to Ukrainian aviation of the era of the Liberation War of 1917-1921. and its aviators. The book contains a large number of photographs, some of which are published for the first time. As an appendix, the last pages of the publication contain images of high-quality reconstructions of aircraft that were in the service of the UPR and ZOUNR during 1917-1920.