United States. Bureau of the Mint. "2014 Biennial Report to the Congress : Appendix 2: Production Cost Analysis with Circulating Metal Commodity Metal Prices (December 2014)," Biennial Report to the Congress as required by The Coin Modernization, Oversight, and Continuity Act of 2010 (Public Law 111-302) (December 2014). https://fraser.stlouisfed.org/title/9414/item/687740/content/pdf/usmint_2014-Biennial-Report-appendix-2, accessed on May 30, 2026.