Dave Hughes has always had systematic approach in his books. In Trout Rigs & Methods (Stackpole Books, 2007) he divides trout fly fishing techniques into set of rigs and methods to fish these rigs. The result is an explanation of lots of ways to fish trout. Its downside is certain amount of repetition as different rigs and methods do have lot in common. To my eyes this book is a valuable source book for hardcore fly fisher--over 300 pages of rigs and methods is not for sissies (and I did read it all).
This is starting to sound like a review. I don't want to do that. I simply want to make a few comments about the book. I'll keep it simple: a) lots of fishing techniques in the book, b) some good history stuff but not very much, c) I'm sure I'll put some of these rigs and methods in good use, d) no really deep insight but there are other books for that purpose.
Well, maybe this is a review.