In its time, this book was undoubtedly the best thing anybody had written about unreleased Dylan. Cable goes through each of the then-available tapes/sessions/shows that circulated and provides setlists and comments. His commentary is often very accurate, but of course, all of this information is not even 5% (probably much less) of the giant pool of available unreleased Dylan TODAY. That said, it's an entertaining book and I wish someone with access to more sources would attempt a similar effort today.