Protocol relating to an amendment to the Convention on International Civil Aviation (Article 56), signed at Vienna on 7 July 1971 = Protocole portant amendement de la Convention relative à l'aviation civile internationale (Article 56), signé à Vienne le 7 juillet 1971 = Protocolo relativo a una enmienda al Convenio sobre Aviación Civil Internacional (Artículo 56), firmado en Viena el 7 de julio de 1971.
International Civil Aviation Organization.
Montreal, Quebec : International Civil Aviation Organization,
1971.
Cover title.
English, French, and Spanish.
Aeronautics, Commercial
Protocol relating to an amendment to the Convention on International Civil Aviation (Article 56), signed at Vienna on 7 July 1971.