On the referring page are some nice images giving a graphical overview of the candidate matches starting in 1965. I hadn't seen them before and suppose they are from Wikipedia or similar. Finding those made the whole exercise worthwhile; one of these days I might try to locate the original source.
It didn't take long to establish that the graphical overviews were not from Wikipedia. The following image compares one newly discovered graphic with Wikipedia's page World Chess Championship 1966.
After a little sleuth work, I located the originals on Mr. > Office > Chess History > World Championship, under the directory labelled '1964-1966'. Their creator has also published a Silverlight show at World Championship Cycles - Windows Live, using all of the material under the previous link. The crosstables are very nice work and deserve a better framework. Talk about hiding your lamp under a bushel basket!
Another resource I discovered during the same exercise, but did not include in 'Access to Referrers' was Caissa Schach Chronik - Ergebnisse und Tabellen der Geschichte, a German language site. Under the WM tab are entries covering each of the FIDE cycles, including zonals. For example, the page for the zonals played as part of the first complete FIDE cycle is here: WM 1951 Setzliste und Ergebnisse der Zonenturniere. There is lots of material here to compare with my own page on the subject, World Chess Championship Zonals.