14 November 1966: Memorandum from Disarmament Division - U.S. ABM Briefing
External Affairs's Disarmament Division noted that U.S. ABM deployment would constitute an “escalation of the arms race to a new and higher level.” Disarmament further expressed skepticism about the professed American commitment to communicating with allies on this important issue.
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Disarmament Division to Defence Liaison (1), 14 Nov. 1966, LAC, RG-25-A-3-c, vol. 10357, file no. 27-11-7, part 1.