Communication codes and abbreviations ...
Edition: 4.ed.
Series: Its Doc -- 6100-COM/504/4; Doc (International Civil Aviation Organization) -- 6100-COM/504/4
Published: 1961
Place of publication: Montreal
Language: eng
Notes: "This edition incorporates all amendments approved by the Council prior to June 1961 and supersedes, on 1 July 1961, all previous editions of Doc.6100-COM/504."