Memorandum for the Chairman of the Joint Chiefs of Staff, “99 Year Lease of Northern Greenland,” from Mansfield Sprague, 30 September 1957, enclosing Information Control Sheet, 19 September 1957, with letter to Sprague from Assistant Secretary of State for European Affairs C. Burke Elbrick and views of “Ambassador Coe on Joint Chief of Statt Memorandum,” Top Secret