Oh yes, the Guide; which we know (despite being viewed by many as the standard respository of all knowledge and wisdom), has many omissons and contains much that is apocryphal, or at least wildly inaccurate.  By the way, the 1981 edition is currently available to view on Amazon Prime.  It is in many respects as good as the 1978 edition but with pictures!

(With apologies Ed Popko who raised this excellent question, and to those on this forum who have absolutely no idea what we are talking about.)