I've got a nook and I have found books, there's a bunch of Geirlach's books available. Some of the more famous fly fishing books, but I didn't count the number. Above all that there's a large body of historic fishing and fly fishing books available for free, which is always a good thing. As I said in another thread I recently read a book about fishing in Scotland, which included fishing the Tweed River. It was free. Also very good. Andrew Lang in his day was a very famous Scottish writer, editor, printer, and historian. He also wrote a book about the Royal Stuarts, which I haven't read, but I have. It is a technology that is just coming into its own.
There are no books about FFing in PA available.