G'day! There are 2 more countries that have official ISO-3166-1 codes now. Palestine: PSE (not PSX) Åland Islands: ALA (not ALD) I understand that correcting these would be a breaking change, but they would also improve the ability to join on other standardised datasets.

Thanks! I'll fix. The files are versioned by year (see https://observablehq.com/@visionscarto/geo), to anticipate these types of changes. (Looking into it I think it's been PSE for a long time, and I don't remember why it shows up as PSX in these files.)