Convert OB Annex 1154: Status of Radiocommunications between Amateur Stations of different Countries (In accordance with optional provision No. 25.1 of the Radio Regulations) and Form of Call Signs assigned by each Administration to its Amateur and Experimental Stations RR 25.1 #13
https://github.com/ituob/service-publications-refs/tree/master/1154-RR.25.1