Hi! I have been tying for a little over a year now, and I am learning more and more every day. There is two (2) books that I got recently that have helped me a lot.
The firts one is "Hooks for the Fly" by William E. Schmidt. This is a very usefull book to identifiy the hook the recepies call for. If you do not have the same hook you can look at the tables and find the one that is compatible, and if you have hooks from local shops, that are not on the compatibility tables there is a section after each of the hooks manufacturers, that shows how the hook looks like, therefore you can select one out of your stock that look as close to it as possible. Very usefull and practical book.
the second one I founded in Half Price Books and is called "The Art of Fly Tying"" by Claude Chartrand. Excellent photography and graphics. The graphics are for the different technics of applying materials to the hook, very good descriptions step by step on all kind of different materials.
Hope you guys can find them, both are terrific.