The following link provides an interesting and full report with information and many photos about the use by the major military powers of helicopters during Second World War, undoubtedly, a rare theme and little explored in topics. The article can be viewed by visiting the link below:
http://aviacaoemfloripa.blogspot.com.br/2011/02/asas-rotativas-na-segunda-guerra-mundial.html
Greetings!
