This book is NOT a companion to the box set recordings that feature all of Johnson's songs and alternate takes. This book has a partial arrangement every song, but not every take. The arrangements are not complete, and varies from song to song.
There is not much guidance on playing, just the transcriptions. This may leave many people puzzled about how to approach the tunes, especially with using a slide and the alternate tunings and fingerings.
Take a look at some of the other books available. Robert Johnson: The New Transcriptions is a much more complete effort, with accurate tunings and capo positions. Robert Johnson: At the Crossroads is a prior editon of the same book, and may be found a little cheaper.