Federal Reserve Bank of Dallas. "[Instructions to Issuing Agents for Placing Social Security Account Numbers on U.S. Savings Bonds, Series E, and Related Registration Stubs], Circular No. 73-19," District Notices (Federal Reserve Bank of Dallas) (January 24, 1973). https://fraser.stlouisfed.org/title/5569/item/544992, accessed on January 30, 2025.