Cell phone coverage in Alaska?

I'd try to get the Milepost BEFORE your trip so you can really use it. It has excellent history of the areas and good maps. It doesn't even have to be the current issue. The history and maps don't change.

Are you near a bookstore that could get it for you? Major Visitor Centers sometimes carry books or your Chamber of Commerce might be able to help or perhaps your library has a copy to loan out.