About the Book Books on the History of Military Aviation examine the role of aircraft aand other flying equipment. Serious development of propeller driven military aircraft began during Word War 1. These were much more advanced by World War 2, which saw the first introduction of jet powered war planes (by the Germans), but too late to be a decisive factor. Titles include: The Mechanics of the Aeroplane: A Study of the Principles of Flight, Our Air Force. The Keystone of National Defense, and The History of the 50th Aero Squadron. About us Trieste Publishing's aim is to provide readers with the highest quality reproductions of fiction and non-fiction literature that has stood the test of time. Our titles are produced from scans of the original books and as a result may sometimes have imperfections. To ensure a high-quality product we have: thoroughly reviewed every page of all the books in the catalog repaired some of the text in some cases, and rejected titles that are not of the highest quality. You can look up "Trieste Publishing" in categories that interest you to find other titles in our large collection. Come home to the books that made a difference!