BTW, Murray —
In that same series — Masters of the Blues Guitar — Grossman also has Blind Boy Fuller, Rev. Gary Davis, Blind Blake and Lonnie Johnson. They're all worth getting, even if it's just for the CDs included and the words.
Of course you have to work your way up to Davis and Johnson — they are very complex. I've got 'em all and I'm slowly working my way through them. Started with MJH, then a few from BBF and now I'm working on Blake. Not doing everything in each book, but learning as I go along. Also working on some Big Bill Broonzy stuff and the other two helped with that — some of the same licks involved.