ICAO DOC 7910 Location Indicators Ed 156
A listing of four-letter location indicators and, where available, corresponding three-character International Air Transport Association (IATA) location identifier codes for geographical locations throughout the world, and a list of the addresses of centres in charge of flight information regions (FIR) and/or upper flight information regions (UIR).
New edition quarterly.
Quadrilingual: E/F/S/R; Some parts of the document are given in English, French, Spanish and Russian. Other parts are in English only.