Not knowing Tony's exact route our state maps will more than likely have many of the roads labeled on there to give you a big picture view.
Like Tony said Benchmark Maps (they are Atlas size) have all the details and the best prices are on Amazon here: Benchmark Maps
We build all of our maps from Benchmark base maps as does Tony designing these routes.
You can always photocopy or cut out the pages you need and highlight the exact route with a highlighter if you don't want to bring alot of atlases.
The reality of navigating on remote routes like this is that many of these roads/intersections are not labeled. You might come to an intersection in the middle of no where and have an option of 2 unmarked roads. Without a GPS to follow a map would not help you. It's best if more than 1 of you in the group has a unit w/ the route on it as a backup.
Tony has chosen very remote western routes where you need to be on your toes and have all the tools, equipment, water, fuel etc. with you. You need to plan properly as you might not see anyone for hours/days. If you are coming from populated places this is terrain is another world with no one to bail you out. Many places will NOT have cell coverage.
The rewards are some of the finest remote western riding you'll ever experience!