Title 31 of the United States Code outlines the role of the money and finance in the United States Code.
Subtitle I — General
Subtitle II — The Budget Process
Subtitle III — Financial Management, within which chapter 39 deals with prompt payment of federal debts
Subtitle IV — Money
31 U.S.C. § 5112(a)(1) — Sacagawea dollar
31 U.S.C. § 5112(e) — American Silver Eagle
31 U.S.C. § 5112(l) — 50 State Quarters
31 U.S.C. § 5112(n) — Presidential $1 Coin Program
31 U.S.C. § 5112(o) — Presidential $1 Coin Program#First Spouse Program
Subtitle V — General Assistance Administration
Subtitle VI — Miscellaneous