I love books. Even though I spend hours on the internet I still prefer turning pages for some types of research. That includes guide books country guides, area guide or camping guides.
Of course while you´re on the road books, unless you have to physically carry them, are great to dip into and plan your next stopover.
These are a couple of my favourite campsite guide books, one an old popular favourite guide and the other a new up-and-coming one.
Alan Rogers an old favourite still very popular, it´s updated every year and has many individual country guides and a European guide.
Cool Camping guides are growing rapidly since beginning with their UK guide. There isn´t a Spanish one yet.