Church's book is more accurate than the Milepost even though it might not be updated every year. It gives ALL the details of the campground, RV park, boondocking places and it give the GPS coordinates, helpful hints to the areas, etc. The Milepost doesn't come close.
The Church's have lived in Fairbanks. They've traveled to the lower 48 many, many times. They know those camp spots.
We use the Milepost for history and maps but never for campgrounds. Even with it being marketed at a 2016 edition, you'll still find things closed down.