... with Paul Arnold's "Wisdom of the Guides".

That book is a compilation of interviews with ten or twelve highly regarded western guides ( think the Intermountain West and Northern Rockies )
done in the late 1990's. Last time I checked, not all that long ago, it is still available ( think it was Amazon ). It's an easy read at about 150 pages with some really knowledgable and interesting fly anglers / guides.

I haven't read a lot of books on fly fishing, but of those that I have read, this is the best one, period.