In reply to Ginger McGrath:
SWISS ROCK - GRANITE BREGAGLIA in English is available as an adobe digital edition and I have a hard copy too - by CHRIS MELLOR - VOID PUBLISHING 2000.(210 pages)Includes most classics.
Versante sud have editions for the area in Italian and German - I have the German ed with the title - NICHTS ALS GRANIT.(sertori and lisignoli)2007.(370 pages)
I also have an Italian guide called MASINO BREGAGLIA...REGNO DEL GRANITO by Andrea Gaddi - editzione polaris 2007. This is very compact and produced locally in Sondrio. (500 pages)
Have a great trip.