Data entry notes:
Adopted at the twelfth meeting of the International Whaling Commission. The Amendments entered into force , except for Japan, Norway, Union of Soviet Socialist Republics and United Kingdom of Great Britain and Northern Ireland, 26 January 1961, except for paragraph 8(a) which entered into force , except for Japan and Union of Soviet Socialist Republics, 23 January 1961. Paragraph 8(a) entered into force for Japan and Union of Soviet Socialist Republics at later dates.