Lysator has been around since forever. The English information page [1] says it was founded in 1973. I remember it from the early days of the Internet and possibly even from Usenet days.

Among other things it has a large repository of historical documents and papers on C programming and standardization dating back to the 1980s. See [2].

For what it's worth, I bookmarked the latter link in 2001.

[1] http://www.lysator.liu.se/english/

[2] http://www.lysator.liu.se/c/

Don't know but interestingly the Pike programming language was developed at Linköping University. Perhaps Rob Pike has gained some kind of demigod status there?

If it's anything like most universities I knew (especially in the 90s and early 2000s) then their CS department websites can host all kinds of documents, papers etc such as this, e.g. from ESR stuff to "Worse is better", Beejs guide etc.