Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
Crawl EF from Alexa Internet. This data is currently not publicly accessible.
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20051119163215/http://ai.eecs.umich.edu:80/cogarch0/common/prop/metaknow.html
Meta-knowledge
Meta-knowledge may be loosely defined as "knowledge about knowledge".
Meta-knowledge includes information about the knowledge the system
possesses, about the efficiency of certain methods used by the system, the
probabilities of the success of past plans, etc. The meta-knowledge is
generally used to guide future planning or execution phases of a system.
