Fifth edition. — New York - London: MC Graw - Hill Book Company, 1944. — 165 p.
What Is a Helicopter?
The Helicopter Comes or Act
HistoricaL Perspecrive
Helicopter Design
Helicopters at War
Helicopters in Commerce
The Helicopter and You
Social Impact
Reconversion and Postwar Problems
List of Organizations Engaged in Manufacture or Development of Helicopters
Additionally posted 2 videos on the history of aviation: the early German helicopter (1 min 49 sec) and the initial history of aviation (2 min 50 sec)