Context

Context of Navigation : icebreaking : agreements between the United States of America and Canada extending the agreement of October 28 and December 5, 1980, as extended, effected by exchange of notes at Washington, December 4 and 5, 2000 and effected by exchange of notes at Washington, December 5, 2005 and effected by exchange of notes at Washington, November 30 and December 2, 2010
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