Solar Electric Reclaimed Materials Rammed Earth......
Greenroofs101 Includes FAQ, plant lists for Europe and the US, advantages and issues, and a bibliography.
If......
http://www.greenroofs.com/Greenroofs101/index.html
Rooftop Pleasures / Revel in nature atop ten SF rooftop gardens Guide to publicly accessible gardens in San Francisco....
http://www.sfgate.com/cgi-bin/article.cgi?file=/gate/archive/2002/05/25/rooftops.DTL