16 December 1970 16 December 1970 16 December 1970 16 December 1970 9 June 1971 21 July 1971 16 February 1971 24 August 1971 16 December 1970 16 December 1970 16 December 1970 18 January 1971 16 December 1970 15 September 1971 Date of deposit of Instrument of Ratification or Accession 11 October 1974 12 December 1973 20 September 1973 10 August 1978 16 May 1979(2) 2 May 1984 20 August 1976 21 December 1972 9 May 1984 13 August 1971 (2) 29 June 1973 12 November 1982(2) 27 August 1976(2) 25 January 1972 3 December 1971 24 November 1975 16 August 1971 19 February 1974 9 January 1973 15 September 1983 19 April 1971 18 November 1971 11 January 1977 25May 1979(5) 10 August 1073 27 July 1978 1 February 1982 4 October 1978(6) 22 November 1978 21 December 1972(2) 4 May 1985 29 September 1971 1 November 1978 25 April 1983 19 July 1972 3 June 1983 8 October 1971 24 October 1975(7) 17 May 1984 19 January 1979 27 August 1973(8) 12 February 1974 6 November 1973 I ... States Niger Nigeria Norway Oman Pakistan Panama Papua New Guinea Paraguay Peru Philippines Poland Portugal Qatar Republic of Korea Romania Rwanda Saint Lucia Saudi Arabia Senegal Seychelles Sierra Leone Singapore South Africa Spain Sri Lanka Sudan Suriname Sweden Switzerland Syrian Arab Republic Thailand Togo Tonga Trinidad and Tobago Tunisia Turkey Uganda Ukrainian Soviet Socialist Republic Union of Soviet Socialist Republics United Arab Emirates United Kingdom United Republic of Tanzania United States Uruguay Date of signature 19 February 1971 9 March 1971 12 August 1971 16 December 1970 30 July 1971 16 December 1970 16 December 1970 16 December 1970 13 October 1971 16 December 1970 10 May 1971 19 July 1971 8 September 1971 16 December 1970 
**Analysis**
After reviewing the text, it appears to be a list of dates related to international treaties or agreements. The dates seem to be associated with countries, which suggests that the text may be related to international cooperation or diplomacy. Given the lack of specific details about the content of the agreements, it is difficult to pinpoint a specific category related to economic development, natural resources, agriculture, industry, transport, international trade, health, education, employment, humanitarian aid, culture, or science and technology.

**Category**
International cooperation, Diplomacy