While doing this I noted a few other anomalies that need more research. For example, the page covering Zonals 2001-2002 (C20) starts with '0.0 FIDE Internet Qualifiers 2001-09', but this unique event is not adequately explained.
10 September 2014
Starting with the first zonal cycle, Zonals 1948-1951 (C01), I stepped through all 26 cycles listed at the bottom of the index page World Chess Championship Zonals, looking for mismatches between the year & month shown on the event header (e.g. 'CAN Quebec City 1947-00') and the same info in the corresponding clipping (e.g. 'June'). I found 20 cycles with mismatches and updated the headers.