United States. Bureau of the Mint. "2016 Biennial Report to the Congress,"
Biennial Report to the Congress as required by The Coin Modernization, Oversight, and Continuity Act of 2010 (Public Law 111-302)
(June 2017).
https://fraser.stlouisfed.org/title/9414/item/687741, accessed on January 25, 2026.