Treaty tariffs are unconstitutional, whether they covenant for special duties in our tariff or provide for free imports into the United States : an argument read before the Association of American Economists, at its session in the city of Washington, February 15th, 16th and 17th, 1883 : with the remarks thereon by the Hon. William Lawrence ... / - Mason, David H. (Culver, Page, Hoyne & Co.,, 1883)