A great book I'd suggest to anyone would be Shady Grove, Acoustic Guitar Solos By Jerry Garcia. Written by Dix Bruce who has written many a great guitar book.
The Garcia/Grisman Album Shady Grove is an acousitc classic, all old cover songs of folk and shanty classics. But it really shows off Jerry's acoustic chops and his great ability to play simple songs but in a complex way bringing them to life. This book transcribes everything he plays in both tab form and sheet music. With all the lyrics too. There are a couple of songs that he plays Banjo on that album, well those have been transcribed too to play on guitar.
If you have the album Shady Grove then get this book and play along, if you don't then get both, you will need both to play along.
This is a great book and it really shows off just what a complex and advanced acoustic player Jerry was.
http://www.deaddisc.com/books/Shady_Gro ... _Solos.htm