Federal Reserve Bank of Dallas. "Revised List of OTC Margin Stocks, Circular No. 77-7," District Notices (Federal Reserve Bank of Dallas) (January 7, 1977). https://fraser.stlouisfed.org/title/5569/item/542268, accessed on August 18, 2018.
OTC Margin Stocks, Revised List, Effective 12-30-76, Pursuant to Provisions of Regulations G, T, U, and X