The document itself is still available in the link following the one removed.
Applied. Gerald Index: readings.html =================================================================== RCS file: /cvs/gcc/wwwdocs/htdocs/readings.html,v retrieving revision 1.259 diff -u -r1.259 readings.html --- readings.html 8 Feb 2017 18:44:56 -0000 1.259 +++ readings.html 12 Feb 2017 08:09:17 -0000 @@ -326,9 +326,6 @@ <li><a href="http://www.open-std.org/jtc1/sc22/wg14/www/docs/summary.htm">C99 Defect Reports</a></li> - <li><a href="ftp://ftp.uu.net/doc/standards/ansi/X3.159-1989/">C89 - Rationale (sources)</a></li> - <li><a href="http://www.lysator.liu.se/c/rat/title.html">C89 Rationale (HTML)</a></li>