Federal Reserve Bank of Dallas. "Amendments to Regulations G, T and U (OTC Margin Stock Delisting Criteria) (Proposed Amendments Concerning Same-Day Substitution Rule), Circular No. 72-88," District Notices (Federal Reserve Bank of Dallas) (May 11, 1972). https://fraser.stlouisfed.org/title/5569/item/544762, accessed on January 30, 2025.