United States. Bureau of the Mint. "2014 Biennial Report to the Congress : Appendix 3: Alternative Metals Study Phase II: Coin Industry Stakeholder Feedback (September 1, 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-3, accessed on March 5, 2026.