Don't neglect the "old" books, those that you may not find in Barnes & Noble. I could spend hours listing some of the authors I grew up reading in the fly fishing arena.
Stop in any and all used books stores you see. 99% of my collection came from those places. And while you're at it, take a ride up Route 209 and head to Route 54 and the Hometown Flea Market on Wednesdays, lots of books floating around there.
Whiskey will get you through times of no fish, better than fish will get you through times of no whiskey.