Nice to see Lito getting a little love here. His books (and videos) along with LeMaster's "Ultimate Skiing" are my faves. Together they provide a nice "right brain, left brain" approach to better understand skiing and how to ski better.
I read Witherell's "How the Racers Ski" and am working through his follow on "The Athletic Skier". Interesting to find concepts such as "ski the slow line fast" and "virtual bump", (although Witherell may not have called it exactly that) in these older works - those and other things that have shown up a lot here on Epic and other places over the years. LeMaster acknowledges him, maybe others have too, but it surprises me there's not a thread dedicated to him here. There is one specifically about boot fitting that draws from that content in his books, but not one that deals with him generally and what he's meant to modern skiing. Is he the Philo Farnsworth of the sport? Or maybe the Tom Dowd?
Back on topic, apparently it's not on Nolo's bookshelf, but I also think Mark Elling's "The All Mountain Skier" is an excellent resource, particularly for someone just getting into skiing who wants to begin to try and understand the whole kit and kaboodle. If I had to have one single book it would be that one.
Witherall was years ahead of his time with the concepts of ramp angels, canting, proper boot fitting, carving, etc. He gave away the secrets used by the Austrians and other European teams. But with so many people now seeking something other than setting an edge and carving, he is forgotten by many. What he did at Burke Mountain Academy also deserves a post.