St. Lawrence Seaway tariff of tolls : agreements between the United States of America and Canada, amending and supplementing the agreement of March 9, 1959, as amended and supplemented, effected by exchange notes signed at Washington April 26 and May 1, 1991 with memorandum of agreement.
Washington, D.C. : Dept. of State : For sale by the Supt. of Docs., U.S. G.P.O., [1993?]