Federal Reserve Bank of Dallas. "RCPC Boundary Change/Oklahoma Banks, Circular No. 79-99," District Notices (Federal Reserve Bank of Dallas) (June 5, 1979). https://fraser.stlouisfed.org/scribd/?item_id=542690&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19790605_no79-099.pdf&start_page=1, accessed on September 20, 2017.
RCPC (North Texas Regional Check Processing Center) Change/Oklahoma Banks From Participating to Dallas Country Banks. Effective 7-1-79.