Hearings Before a Subcommittee of the Committee on Foreign Relations, United States Senate, Eightieth Congress, First Session, on S.J. Res. 111, a Joint Resolution Approving the Agreement Between the United States and Canada Relating to the Great Lakes-St. Lawrence Basin, with the Exception of Certain Provisions Thereof ; Expressing the Sense of the Congress with Respect to the Negotiation of Certain Treaties ; Providing for Making the St. Lawrence Seaway Self-liquidating ; and for Other Purposes, May 28, 29, June 11, 12, 13 and 20, 1947