Hal Leonard Blues Guitar Method by Greg Koch-
I don’t have this particular one, but I have the rock and country books in this series, and both are very good. Greg Koch is a great educator, and knows his blues, I can vouch for that. Greg used to write one of my favorite columns in Guitar One magazine. Very entertaining and informative, so I’d say you probably couldn’t go wrong with this book.
Best of Stevie Ray Vaughan – also by Greg Koch.
You can’t go wrong learning SRV’s licks, and like I said in the
previous paragraph, you can’t go wrong with Greg Koch.
Blues by the Bar – by Chris Hunt
An in depth study of what to play for each bar of the blues progression.
After you learn a few blues licks, this book will help you play more confidently on a blues tunes.
101 Must Know Blues Licks by Wolf Marshall
Wolf Marshall is one of the most prolific guitar authors I’ve seen.
I have his “Best of Jazz Guitar”, reviewed on the jazz page, and it’s great.
This dude is THOROUGH, and you will learn a lot about the history of the blues.