I have those books.

I recommend reading something like this, before you try to tackle A. Adams books:
http://www.amazon.com/Practical-Zone...ds=zone+system


I don't get the updated for *D* snaps as well, but I suppose that's one way to re-sell your book, "New edition with additional information for *D* shooters".

I found that book to be a very easy to understand approach to the principles of the zone system.