Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Must Have For All Salt Water Fly Tyers

This is a superb book on tying more sophisticated salt water flies. This is not a book for beginners. Only buy it if you have spent some time at the vise/bench. If you have, you will not be disappointed. In addition to reviewing flies and how to tie them, it covers a lot of material on fish feeding habits, habitats and presentation.