tz-link.html in tzcode2013c contains a link to the CLDR tzid chart page as below:

<li>Some Microsoft Windows versions contain time zone information in
an undocumented format, with IDs that can be mapped to <code>TZ</code>
values using the <a
href="http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/zone_tzid.html">Zone
&rarr; Tzid table</a> maintained by the <abbr
title="Common Locale Data Repository">CLDR</abbr> data mentioned
below.</li>

The URL is not permanent (cldr-tmp) and the linked page contains out of date information (CLDR 21 - latest version is 23).
The correct URL is http://unicode.org/cldr/charts/supplemental/zone_tzid.html

Please fix the link in the next tz version.

Thanks,
Yoshito