The Polygon Warbirds No. 1 Polikarpov I-5, I-15, I-15 bis Reference Book is a multicolor publication focusing on the Polikarpov I-5, I-15, and I-15 bis aircraft. It is a valuable resource for enthusiasts and collectors interested in detailed information about these specific models. The book likely includes historical background, design characteristics, and assembly instructions to help builders recreate accurate replicas of these iconic aircraft. With its focus on the United States as the country of origin, the book may also provide insights into the cultural significance and impact of these aircraft in the hobby and aviation communities.
