Book called "The Helicopters are Coming"
I have a hardback book from 1944, titled "The helicopters are Coming" which is an interesting read. Published in 1944 in the USA by C.B.F Macauley.
In the front page it has a stamp statng it was from the ROTOL reference library, does anybody know where this library was.
Also can anybody state if there are any books on Helicopters older than this.