Federal Reserve Bank of Dallas. "Custody of Securities, Circular No. 77-83," District Notices (Federal Reserve Bank of Dallas) (August 2, 1977). https://fraser.stlouisfed.org/scribd/?item_id=542344&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19770802_no77-083.pdf&start_page=1, accessed on October 24, 2017.
Bulletin 7 Custody of Securities. to Be Amended, Effective 12-1-77. Improvements in Service of Joint Safekeeping of Pledged Securities for Member Banks and Political Subdivisions.