31 C.F.R. § 601.1 Notice to the public.
Title 31 - Money and Finance: Treasury
The Secretary of the Treasury, by authority of law, has adopted a new distinctive paper for use in printing United States currency in addition to the existing distinctive papers for use in printing United States currency and other securities.
Title 31: Money and Finance: Treasury
PART 601—DISTINCTIVE PAPER FOR UNITED STATES CURRENCY AND OTHER SECURITIES
§ 601.1 Notice to the public.