Federal Reserve Bank of Dallas. "Holidays-June, Circular No. 68-126," District Notices (Federal Reserve Bank of Dallas) (May 23, 1968). https://fraser.stlouisfed.org/scribd/?item_id=543833&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19680523_no68-126.pdf, accessed on December 12, 2017.
Holiday Federal Reserve Bank, Boston Will Close 6-17-68. No Other Holidays Will Be Observed by Any Other Federal Reserve Banks for June.