I found a neat guide to Texas campgrounds at this website
. It had been recommended to me by some friends and, since my old guide was getting pretty out of date and frazzled, I ordered it. $17.95 postpaid. Covers state and national parks and a lot of local parks.
Lots of good information; a good word description and photos of the campgrounds. Also a map showing the location and distance to the nearest WalMart. There is a section for notes, a section of camping recipes, and even a couple of snap-out postcards. It's spiral bound to lay flat whhich is handy.