Near enough I think it was "generation of electricity by wind power". It was re published in the 70's by Spon I think, Still excellent and the wind data stuff is as relevant as ever.
I agree that Paul Gipes works are a must for any serious wind power enthusiast.
I think there were several books by Jack Park, I don't recognise the one someone mentioned but I have come across "simplified wind power systems for experimenters" Helion inc 1975.
There is also Calverts book, windpower principles or something that was originally very expensive but seems to be available fairly cheaply now. Not that useful unless you want to play with Cretan Mills.
There is also another very old and mainly useless work by Powell, fun for the historic point but little use for today's ideas.
Flux