"This is still the first book I would give to a novice...it is still the best basic introduction to fly-fishing." - Nick Lyons (columnist for Fly Fisherman magazine. "He is acknowledged by the angling fraternity of all North America, and maybe the English-speaking world as the greatest writer on angling since an old chap called Izaak Walton." - Gregory Clark
Roderick Langmere Haig-Brown (February 21, 1908 — October 9, 1976) was a Canadian writer and conservationist, who is acclaimed internationally for his writing on fly fishing.
some stuff's a little dated but still interesting and Roderick Haig-browns writing is great if you like this id recommend he's other books which are less instructional.