| 22 December 1952 |
1 January 1954 |
International Telecommunication Convention (with Annexes, Final Protocol and Additional Protocol) |
| 3 October 1957 |
1 April 1959 |
Universal Postal Convention [together with Final Protocol, Detailed Regulations and Annexes, Provisions concerning Air Mail with their Final Protocol and Annexes] |
| 14 December 1960 |
22 May 1962 |
Convention against Discrimination in Education adopted by the General Conference of the United Nations Educational, Scientific and Cultural Organisation at its Eleventh Session |
| 30 March 1961 |
13 December 1964 |
Single Convention on Narcotic Drugs, 1961 |
| 10 July 1964 |
1 January 1966 |
Agreement concerning Postal Parcels [with Final Protocol, Detailed Regulations and Final Protocol thereto] |
| 10 July 1964 |
1 January 1966 |
Constitution of the Universal Postal Union [with Final Protocol, General Regulations and Final Protocol thereto] |
| 10 July 1964 |
1 January 1966 |
Universal Postal Convention |
| 15 November 1965 |
10 February 1969 |
Convention on the Service Abroad of Judicial and Extrajudicial Documents in Civil or Commercial Matters |
| 14 November 1969 |
1 July 1971 |
Universal Postal Convention (with Final Protocol and Detailed Regulations) |
| 14 November 1969 |
1 July 1971 |
Additional Protocol to the Constitution of the Universal Postal Union (with Declarations, General Regulations, Final Protocol and Rules of Procedure of Congresses) |
| 14 November 1969 |
1 July 1971 |
Additional Protocol to the Constitution of the Universal Postal Union (with Declarations, General Regulations, Final Protocol and Rules of Procedure of Congresses) |