COLLECTED BY
Organization: Internet Archive
The Internet Archive discovers and captures web pages through many different web crawls. At any given time several distinct crawls are running, some for months, and some every day or longer. View the web archive through the Wayback Machine.
Collection: Wikipedia Outlinks May 2011
Crawl of outlinks from wikipedia.org started May, 2011. These files are currently not publicly accessible.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20110606104925/http://www.nsf.gov/statistics/nsf07325/pdf/tab12.pdf