A book set that provides in-depth knowledge of fly fishing techniques and strategies. These are old books, but they have no tears or folds. - Book Title: Satoshi Sato's Fly Fishing: Common Sense and Secret Techniques - Book Title: Nymph Fishing Tactics These are books by Mr. Satoshi Sato. After reading these, I started fishing with nymphs all the time. They are incredibly helpful. If you've started fly fishing but aren't catching anything, I highly recommend reading these. You'll fall into the deep end of sinking line fishing.