William Duane Ennis eBooks
eBooks di William Duane Ennis
Flying Machines Today. E-book. Formato PDF
William Duane Ennis
edizioni Forgotten Books collana , 2017
The suggestion that some grasp of the principles and a very fair knowledge of the current practices in aeronautics may be had without special technical knowledge came almost automatically. If this book is comprehensible to the lay reader, and if it conveys to him even a small pro portion of the writer's conviction...