International development and security : Hearings before the Committee on Foreign Relations, United States Senate, Eighty-seventh Congress, first session on S. 1983, a bill to promote the foreign policy, security, and general welfare of the United States by assisting peoples of the world in their efforts towards economic and social development and internal and external security, and for other purposes, May 31, June 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 19, 20, 21, and 27, 1961