Books on my booklist; not exactly stone related.... but celtic saints are interesting (a bit like folklore), because they seem to hone in on burial sites and stone circles and of course water,
Elizabeth Rees - Celtic Saints, Passionate Wanderers;
Nigel Pennick - also saints, but celtic paganism as well. Anyone read him?
Also found - Sacred Yews by A.Chetan and three other authors which sounds interesting - BUT one of the authors is David Bellamy, and I never trust a word he writes or says...