Hi 2trapper
Like yourself I also have a copy of the Bang and Dahlstorm one of the first great tracks and sign books IMHO however personally I prefer the Brown, Lawrence and Pope’s Animals Tracks, Trails and Signs by Hamlyn Guides which carries slightly more information for example skulls and dentition which I find very useful.
As for learning and methodology the best book would have to be Jack Kearney’s, Tracking a Blueprint for Learning How. From the very outset the concept of the book was a dedicated “Step by Step System “ to learning the art of tracking.
Bob Carss book The Complete Guide to Tracking is well worth a read with lots of information covering the various techniques employed in signcutting and tracking.
The Louis Liebenberg book The Art of Tracking: The Origin of Science has a vast amount of information from the fundamentals of tracking to systematic and speculative technique, a very in depth book, read it first if you want as it will give you a greater appreciation and better insight as to just how enormous the subject of tracking really is, In the post above Bearbait hit the nail on the head, Quote "more a scientific treatise" but the Liebenberg book will point you in directions you may not have even previously considered, and should be regarded as essential reading for any serious student of tracking.
There are also some very good SF tracking and counter tracking papers available free online and most well worth reading.
Happy Trails Bro.