McDuffie, George, 1790-1851.
Speech of Mr. McDuffie, of S. Carolina, against the prohibitory system; : delivered in the House of Representatives, April, 1828..
Washington, 1828.
Free trade -- United States.
Tariff -- United States -- Speeches in Congress.
Slave labor -- United States.
United States -- Commerce.
United States. Congress (20th, 1st session : 1827-1828). House.
Philadelphia Area Center for History of Science
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