To avoid the inevitable decay of the sources referenced in Code v2, I have moved the URLs to this site. Within the text, any URL has been replaced with a "link #". The links here correspond to that list. If the URL goes bad, the original source is cached at a fantastic new site called "WebCitation.org". WebCite makes it possible to cite a webpage, and they'll keep a cached copy for future reference. Their idea is fantastic and everyone should use it.