Book? What's a "book?"
I gave up on printed paper books several years ago. I don't have a smartphone, but I DO have an iPod Touch, which runs the same OS as the iPhone and the iPad and operates only on wifi. There are a number of inexpensive or free apps for finding campgrounds, all the info that ever was in Woodalls or the GS books, and it gets updated at least annually for no more money. Between GS Camping, Allstays, RVParky, and the Government app, all that info is available for computer search and almost instant find, interfaces with maps, and works great, plus it is a LOT less weight to drag around.
See, here's the thing: printed book campground guides are dinosaurs. Big. Bulky. Heavy. Slow to search. yada, yada, yada. The market is going away. You asked for a good one? Ain't none. Give it up. Get the apps.