Soviet Charges of U.S. Violations of Its Air Space; Changes in the Soviet Leadership, March–June 1958
40. Memorandum From the Deputy Director of Intelligence and Research (Arneson) to the Under Secretary of State (Herter)
Source: Department of State, Central Files, 761.00/3–2758. Official Use Only. Initialed by Arneson.
41. Memorandum of Discussion at the 361st Meeting of the National Security Council
Source: Eisenhower Library, Whitman File, NSC Records. Top Secret; Eyes Only. Prepared by Gleason on April 4.
42. Memorandum From Secretary of State Dulles to President Eisenhower
Source: Eisenhower Library, Whitman File, Dulles-Herter Series. No classification marking.
44. Memorandum for the Record
Source: Eisenhower Library, Project Clean Up, Intelligence Matters. No classification marking. Prepared by Goodpaster.
45. Memorandum of Conversation
Source: Department of State, Central Files, 601.6111/5–1958. Confidential. Drafted by Armitage on May 22.
46. Memorandum From Secretary of State Dulles to the Director of Intelligence and Research (Cumming)
Source: Department of State, INR Files: Lot 58 D 776, Balloons. Top Secret. Initialed by Calhoun and transmitted through the Executive Secretariat.