United States. Bureau of the Mint. "2012 Biennial Report to Congress on the Current Status of Coin Production Costs and Analysis of Alternative Content," Biennial Report to the Congress as required by The Coin Modernization, Oversight, and Continuity Act of 2010 (Public Law 111-302) (December 2012). https://fraser.stlouisfed.org/title/9414/item/687739, accessed on January 16, 2026.