Woodoalls has books from a variety of years and prices at amazon at this link:
http://amzn.to/1KMVxuZ
A new state park book just came out in January 2015
http://amzn.to/1SN0lnf
Now you make me feel guilty for regifting my AAA camp books. They were pretty much the high end RV parks, they didn't really fit my needs. I tend to stick to state, federal, county and city parks. Many of them are still reasonably priced though some have upgraded to accommodate big rigs and added big costs.
One couple I met wrote to the 48 lower states tourism offices asking for camping info and received a ton of free info from each state. They had a file box with 48 folders and info. They were happy with their choice as they didn't care to do internet at all.
Researching campgrounds is very time consuming. I find a state I like and I am trying to visit all their parks. I don't feel the need yet to race about coast to coast just to say I did it. I am slowly savoring the places I end up.
My favorite is a state park that allows me to stay 4 weeks if I move after 2 weeks, so I have 4 weeks reserved in spring and fall to fill my itch.
Many state and federal parks require online or telephone bookings. SOme of the most popular are booked the day the dates open up, so this can be a huge challenge to get spots in those places.
Last summer I ended up in some beautiful places that were not busy at all, I am still scratching my head wondering why, but we surely enjoyed the extra space, peace and quiet.
Word of mouth... you need a way to keep up with the word of mouth referrals. Some of the nicest city and county parks are word of mouth, the local municipality just hasn't bothered to advertise their jewels. There is one I go to that has no reservation system at all. you show up and if you can get in, you can pay for a whole month and enjoy. Twice now I have shown up on Sunday afternoon to claim a spot after the weekenders moved out.
Good luck!
Figure out in your rig where you will keep all the books and papers and most importantly the notes of word of mouth camps.