United Nations Security Council Resolution 139 was adopted unanimously on June 28, 1960. After examining the application of the Federation of Mali for membership in the United Nations, the Council recommended to the General Assembly that the Federation of Mali be admitted.
After the Federation collapsed on August 20, 1960, both Senegal and Mali were admitted as Members of the United Nations under resolutions 158 and 159 respectively.
Works related to United Nations Security Council Resolution 139 at Wikisource