I am a historian and a complete novice to this realm. I want a Geo Chart or Map that will show the global dispersion of letters of condolence following Abraham Lincoln's death in 1865. My data include: country, city, date, type of group, and I may want to add some kind of content variable indicating political sentiment I want the map to show a marker, a small round dot, for each of about 500 letters from all part of the world. I see the GeoChart template with markers indicating variables for countries. How do I use city level data tp visualize the dispersion of these letters? Many thanks for whatever help you can provide. --Don
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