Treaties and other international acts series. 5468. Boundary waters, pilotage services on Great Lakes and St. Lawrence River, agreements between United States and Canada, amending agreement of May 5, 1961, as amended, effected by exchange of notes signed Washington Aug. 23 and Sept. 10, 1963, [entered into force Sept. 10, 1963: operative Apr. 29, 1963], and exchange of notes signed Washington Nov. 19 and Dec. 4, 1963; [entered into force Dec. 4, 1963, operative Aug. 1, 1963].

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