Customs & Border Protection (CBP)
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"As the single unified border agency of the United States," the CBP's official site offers information about importing (duty rates, international agreements, ports of entry), exporting (documents, licenses, and requirements), travel (travel warnings and restricted and prohibited goods, health concerns, business travel), and more. Includes some downloadable forms. Searchable. From the U.S. Department of Homeland Security. [A broken link]
http://www.customs.ustreas.gov/