ISO 3166 Country Codes
"ISO 3166 is the International Standard for country codes and codes for their subdivisions...
Country Name Authority List
"This country codes authority table is intended to provide a code related to the names of the countries – in a short and in a long form – in the 24 official languages of the European Union.These codes are used for the documentary metadata and may present slight differences with those used for the production of documents at a stylistic level...