I ran across a website www.dirtcheapbuilder.com which is an excellent resource for building with traditional and green materials. Their bookshop is quite extensive, I have (a photocopy)the back issues of "The California Plasterer" from the 1930's and it is the most comprehensive source as to the history of plaster and lime, including excellent sections on the frescoes of Italy and India.

Please also note that my new email address is gary@mozaya.com - I haven't had the time to figure out how to change it on this user profile.