books.google.fr - This book traces the history of Sikorsky aviation and its founder, Igor I. Sikorsky, one of the most talented and versatile aeronautical pioneers in history. Sikorsky's aviation career spanned over 60 years and was highlighted by three major achievements: the creation of the world's first four-engine...https://books.google.fr/books/about/The_Sikorsky_Legacy.html?hl=fr&id=eE-trX3XZawC&utm_source=gb-gplus-shareThe Sikorsky Legacy