Books/Ebooks
Treaties in Force: A List of Treaties and Other International Acts of the United States in Force on ... by 
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Call Number: KZ235 .T74 ReferenceCurrent ed. in reference;
2000- ONLINE
Websites
- Foreign Trade Regulations, U.S. Census Bureau
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- Harmonized Tariff Schedule of the United States
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From the U.S. International Trade Commission (USITC).
For Use in Classification of Imported Merchandise for Rate-of-Duty and Statistical Purposes