United States. Department of the Treasury. Citizens Coinage Advisory Committee , United States. Department of the Treasury and United States. Bureau of the Mint. "Meeting, May 18, 2021 : Federal Register Notice" in Citizens Coinage Advisory Committee Meetings, Recommendations, and Minutes (May 18, 2021). https://fraser.stlouisfed.org/title/7136/item/646962/content/pdf/ccac20210518notice, accessed on June 12, 2026.