Federal Reserve Bank of Dallas. "Improved Securities Safekeeping and Transfer System, Circular No. 81-130," District Notices (Federal Reserve Bank of Dallas) (July 1, 1981). https://fraser.stlouisfed.org/scribd/?item_id=541312&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19810701_no81-130.pdf, accessed on November 18, 2017.
Bulletin 7 and 9 Related. Securities Safekeeping and Transfer System, New and Improved, To Be Implemented on 9-24-81.