Telecommunications in El Salvador / United Nations United Nations Conference on Trade and Development. Telecommunications 384.7284 UNT Issued with United Nations publication sales number. Issued in several vols.; each vol. bearing also a distinctive title. SERBIB/SERLOC merged record New York : United Nations, 1954. 1954. 1954 Text Collection v. ; eng Proceedings of the United Nations Conference on Trade and Development Also issued online. Proceedings of the United Nations Conference on Trade and Development Also issued online.