While I was doing this, I noticed that one page, (C21) 2002-2004 Zonal Qualifiers is missing zone numbers for the qualifying players. I'll address that separately.
24 February 2016
Zonal Qualifiers C13-C27 : Summary
After tackling 'Zonal Qualifiers' and 'Qualification Paths' for the last 15 World Championship cycles, I added links for each cycle to my index page on the World Championship Zonals (see the table at the bottom of that page). Here is a summary of the corresponding blog posts:-