A/RES/58/111 (h) To observe annually the Week of Solidarity with the Peoples of NonSelf-Governing Territories; 5 9. Calls upon all States, in particular the administering Powers, as well as the specialized agencies and other organizations of the United Nations system, to give effect within their respective spheres of competence to the recommendations of the Special Committee for the implementation of the Declaration and other relevant resolutions of the United Nations; 10. Calls upon the administering Powers to ensure that the economic activities in the Non-Self-Governing Territories under their administration do not adversely affect the interests of the peoples but instead promote development, and to assist them in the exercise of their right to self-determination; 11. Urges the administering Powers concerned to take effective measures to safeguard and guarantee the inalienable rights of the peoples of the Non-SelfGoverning Territories to their natural resources, including land, and to establish and maintain control over the future development of those resources, and requests the administering Powers to take all necessary steps to protect the property rights of the peoples of those Territories; 12. Urges all States, directly and through their action in the specialized agencies and other organizations of the United Nations system, to provide moral and material assistance to the peoples of the Non-Self-Governing Territories, and requests that the administering Powers take steps to enlist and make effective use of all possible assistance, on both a bilateral and a multilateral basis, in the strengthening of the economies of those Territories; 13. Reaffirms that the United Nations visiting missions to the Territories are an effective means of ascertaining the situation in the Territories, as well as the wishes and aspirations of their inhabitants, and calls upon the administering Powers to continue to cooperate with the Special Committee in the discharge of its mandate and to facilitate visiting missions to the Territories; 14. Calls upon the administering Powers that have not participated formally in the work of the Special Committee to do so at its session in 2004; 15. Requests the Secretary-General, the specialized agencies and other organizations of the United Nations system to provide economic, social and other assistance to the Non-Self-Governing Territories and to continue to do so, as appropriate, after they exercise their right to self-determination, including independence; 16. Requests the Secretary-General to provide the Special Committee with the facilities and services required for the implementation of the present resolution, as well as of the other resolutions and decisions on decolonization adopted by the General Assembly and the Special Committee. 72nd plenary meeting 9 December 2003 _______________ 5 4 See resolution 2911 (XXVII).