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, 1966-69, 1969-72, 1972-75, 1984-87, and 1987-90. The clippings are taken from Graeme Cree's Soviet Championships.