Boundary waters, St. Lawrence Seaway : agreement between the United States of America and Canada, amending and supplementing the agreement of March 9, 1959, as amended and supplemented, effected by exchange of notes, signed at Washington April 21 and August 10, 1988 with memorandum of agreement.
Washington, D.C. : Dept. of State : For sale by the Supt. of Docs., U.S. G.P.O., [1993?]