https://worldchesschampionship.blogspot.com/2008/07/soviet-zonals-1951-87.html
World Chess Championship Blog: Soviet Zonals 1951-87
I added clippings for Soviet Championships which served as zonals to the pages for nine cycles: 1951-54 , 1954-57 , 1957-60 , 1960-63 , 1966...
world chess championship blogsoviet
https://old.fide.com/component/content/article/4-tournaments/11743-maghami-sarasadat-win-zone-31-zonals.html
Maghami, Sarasadat win Zone 3.1 Zonals
FIDE - International Chess Federation
winzone