I have Volume 1 and Volume 2; very good basic info. Teeter was one of the first to publish such a book, pretty much "before the internet," and his books are considered solid and thorough.
I'm only able to do very simple repairs, but I am also fascinated by the whole world of guitar history, guitar building and guitar repair. I get my best fix from the quarterly publication, *Guild of American Luthiers*, a great magazine, with contributions from builders and repair people all over the world, lots of color photos, advice, product reviews, etc.
Some of it's over my head, but it's my favorite guitar magazine, and the only one I read cover-to-cover. Only available by subscription.