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 20, 2008 : Federal Register Notice" in Citizens Coinage Advisory Committee Meetings, Recommendations, and Minutes (May 20, 2008). https://fraser.stlouisfed.org/title/7136/item/646906/content/pdf/ccac20080520notice, accessed on December 1, 2023.