All the main sites and activities of the area will be covered in the main guide books.
The 1: 200,000 Michelin maps (yellow covers) are adequate for most purposes.
The 1:25,000 Institut Geographique (blue covers) are superb and comparable to the Ordnance Survey Maps in the UK. Unfortunately they are quite expensive at around 12 euros.
The Green Michelin guide books (about 17 euros) are adequate for routine sightseeing but each edition seems to get a little more dumbed down. Best are the old ones with detailed line drawings reconstructing buildings with the surviving parts in black and the reconstructed in red. Quite good for general background information about the area.
The Edisud Guides written by a local anorak called Patrick Olivier-Elliott are very good indeed for the villages. He is clearly an exhaustive and enthusiastic ferret around the local villages. He also gives a thumbnail sketch of each village including the date it was founded and the derivation of its name. Illustrations are not so good (they look as if they have been traced from photos) but they do focus your attention on specific features. Unfortunately they are only available written in French and they are costly (18 – 25 euros) and each one doesn’t cover a very wide area. They are not that easy to find in book shops either.