I am having a panel data with the unit is firms in 65 countries around the world with the time series is year level. I am wondering how to get the list of countries in my sample, which is a character variable.
I used the code

list GEOGN with the option fast or constant but it just showed the very last values. (I have around 400,000 observations). And the result table cannot display that much.

Therefore, I am asking how to get the 65 unique country names.