St. Lawrence Seaway : tariff of tolls : agreement between the United States of America and Canada, amending the agreement of March 9, 1959, as amended, effected by exchange of notes, signed at Washington December 12, and 20, 1991, and exchange of notes, signed at Washington November 13 and 16, 1984.
Washington, D.C. : Dept. of State : For sale by the Supt. of Docs., U.S. G.P.O., [1990?]