Source: U.S. Bureau of Labor Statistics
Release: U.S. Import and Export Price Indexes
For more information, please see the Import/Export Price Indexes web site at https://www.bls.gov/mxp/
U.S. Bureau of Labor Statistics, Export Price Index (NAICS): Copper, nickel, lead, and zinc mining [IY21223], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/IY21223, July 9, 2020.