Of course, Bruce Lee was always changing his methods and ideas about training. To what degree he would have stood behind this material some 40-years later has been the subject of much debate. The closest thing to a modern version of this series is How to Master Bruce Lee's Fighting Style by Lee student Joe Lewis, who credits much of his success to principles he learned while working with Bruce Lee.
But, "never take your eyes off the finger, or you will miss a great book for any Bruce Lee fan."