Village Library
The Mabe Village Library is located on the west side of Mabe Village, and holds a number of books available to read. These books are:
Selecting the Item that's Right For You
Auto Map and Memo Guide Book
Secrets of the Whirling Blade
How to Handle Your Shield Like A Pro!
Fun With Bombs
The Properties of Warp Holes
Atlas of Koholint Island
Dark Secrets and Mysteries of Koholint
Most of these books are really just for beginners starting out in the game, but the one Link'll want to read is that last one on the list. Link can't read it right away though, he needs the Magnifying Lens first. It contains a series of arrows pointing in different directions, and this is the way Link must go once he gets inside the Wind Fish's Egg. So Link basically needs to read this book to finish the game, unless he gets really lucky. Also, the arrow pattern changes from game to game, so Link must rememeber it.