We should only be reading books from 1947 to 1973.
There are a lot of countries with very few published or translated into English books. I've probably only got a dozen or two countries left that will be fairly easy to locate a book for. There's a reason Western Africa has proven hard for me to navigate (almost everything is only in French) and the Caribbean, Polynesia and Melanesia areas are just so unpopulated there is very little selection. I've found a few, but then even locating copies of the books is very difficult.
What if we just made the region vote into a journey around the world one where we have to pick an author from a country we haven't covered yet? That might keep things open enough that we'd be able to find books a little more easily.