I was cruising the internet looking for information on soil cement, etc. One site recommended a booklet called , "The Handbook for Building Homes of Earth", so I went looking for a source for that. I found it online, as well as hundreds of other booklets. Wow! http://www.sadl.uleth.ca/nz/cgi-bin/library?a=p&p=home&l=en&w=utf-8 Karen in Alberta