Help on campground directories

I know books are more outdated than maybe the internet, but when your traveling and on the road and need to find a place to stop right then, a book is all I'll have. I do not have a smart phone to pull things up while on the road, nor do I have any desire to look at a teeny tiny screen trying to find a place to stay. Looking in an old fashiioned book is the only option for those times. It's just a question of which book is best for those times. I'd like to think I could plan ahead each day, but logically it wont happen that way all the time.

I too was really disapointed to hear how Good Sams lists the campground in its books, but then I guess AAA does the same thing with hotels in there tourbooks too. :(