Get a copy of the orc tool by following the instructions on GitHub.

Save a live copy of this Register:

$ curl https://registers.app/register/11:248532/rsf | orc clone - iata-region-code

Use orc to use the data from the Register and keep it up to date:

$ orc ls iata-region-code user

You can read more about how to use the command-line tool on GitHub.

Select a human-readable field to use as the text in the picker.

iata-region-code region-name parent-code

Embed this code where you'd like the picker to appear.