I agree on the above This is a great book and willl show you the most ways to do things. Two others are Randy Stetzers 1000 of the best flies and I think its Randal Kaufmanns Flies of the Umqua feather merchants about 1600 patterns. Tale a look at these. Good lluck
I agree, it is the largest and most comprehensive fly tying book in my collection. I use it quite often and am a very very long way from mastering anything or everything in that book. I have a number of others, but you asked for detailed and lots of patterns and pages...I'd look into that one.
I have this book:http://www.flyfishohio.com/fly_tying_made_clear_and_simple.htm
It only has 18 patterns, but it shows every step really well. The selection of flies give you a variety of techniques. In the back there are a lot of patterns with recipes and tips on tying.
Anthony: Good question; all answers helpful but...started buying/collecting books on fly fishing in the sixties; numbered now over 600. About 40% have to do with fly tying patterns. Still looking, still adding. I wish and maybe could be more helpful if I knew what and where your tying efforts are going to be put to the "test." Duane J