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I have an interesting idea for this.

If somehow we could create a big interactive world map of all the countries.

You click the country and it shows all the cities that there are data sheets for
It wouldnt even need to be to interactive.
It could just be dots on a map with the city name. and when you click that city, it links you to the appropriate data sheet

similar to something like this
http://www.yourchildlearns.com/europe_map.htm
nothing fancy. just visually convenient