whyisitsohard,
I've got the Pooley's book.......it's a bit difficult to read for a trainee.
As for the other 2 books, you can get them both from
www.flightstore.co.uk......Cyclic and Collective by Shaun Coyle for £24.95 and Principles of Helicopter Flight by W.J. Wagtendonk for £11.99.
After reading the posts on this thread I may have to invest in both of them too!