On June 7, 2017, U.S. Customs and Border Protection (CBP) published in the Federal Register a final rule [CBP Dec. 17-03] that amends the CBP regulations to reflect the extension of import restrictions on certain archaeological and ethnological materials from Peru. The restrictions, which were originally imposed by Treasury Decision (T.D.) 97–50 and last extended by CBP Dec. 12–11, are due to expire on June 9, 2017, unless extended. The Acting Assistant Secretary for Educational and Cultural Affairs, United States Department of State, has determined that conditions continue to warrant the imposition of import restrictions. The Designated List of archaeological and ethnological materials described in T.D. 97–50 is revised in this document to reflect the addition of Colonial period documents and manuscripts. (See: https://eca.state.gov/cultural-heritage-center/cultural-property-protection/bilateral-agreements/peru.) Accordingly, the restrictions will remain in effect for an additional 5 years, and the CBP regulations are being amended to indicate this fourth extension. These restrictions are being extended pursuant to determinations of the United States Department of State made under the terms of the Convention on Cultural Property Implementation Act, which implements the 1970 United Nations Educational, Scientific and Cultural Organization (UNESCO) Convention on the Means of Prohibiting and Preventing the Illicit Import, Export and Transfer of Ownership of Cultural Property.