The first 51 Countries come from this Wikipedia list, in order of most to least coffee production:
https://en.wikipedia.org/wiki/List_of_coffee_companies
I knew the list was incomplete because I remember tasting some pretty good coffee that was grown in Nepal, Malaysia, Hawaii, and Gran Canaria, Spain before. So, I decided to round up to an even 60 by throwing in some smaller, even teensy tiny by coffee production volume, places.
https://www.nytimes.com/2018/08/28/travel/azores-coffee-tea-wine.html
https://www.astca.org/
You get the idea! ;)