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/title/5569/item/543833, accessed on May 26, 2020.
Holiday Federal Reserve Bank, Boston Will Close 6-17-68. No Other Holidays Will Be Observed by Any Other Federal Reserve Banks for June.