Supplementary rules of procedure relating to the participation in the session of the Trusteeship Council of Italy as the Administering Authority for the Trust Territory of Somaliland and of states members of the Advisory Council for the Trust Territory of Somaliland under Italian Administration which are not members of the Trusteeship Council : adopted by the Trusteeship Council at its 327th, 328th and 329th meetings on 20, 21 and 22 February 1951