Presentation
In my opinion, "Presentation" by Gary Borger is a book that no fly-fisherman should be without. If you want to understand this sport from the perspective of the trout, this is the book to study. Gary provides insight on the total predator/prey relationship that will change your whole approach to fishing. He also explains the science behind it in a straightforward way that the layman can understand. I find this book to be my "Go To" fishing reference time and again. For me it is an indispensable resource.