There remains some info in the Informants that I haven't used yet, mainly from the lists of which tournaments were included in the rating calculations for the period covered by the Informant. These are factually so bare that there only worth is to verify when and where an event was played. I'll include these if I can't find any better sources.
25 August 2010
Zonals 1984-87, 87-90, & 90-93
Over the past few months there has been so much happening with the World Championship that I almost forgot about an unfinished job last documented in the post Zonals 1978-81 & 1981-84. I added crosstables etc. from a number of Informants to the following pages on the World Chess Championship Zonals:-