Federal Reserve Bank of Dallas. "Mutilated Currency, Circular No. 81-214," District Notices (Federal Reserve Bank of Dallas) (November 10, 1981). https://fraser.stlouisfed.org/content/?item_id=541396&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19811110_no81-214.pdf, accessed on July 23, 2018.
Bulletin 5 and Treasury Department Circular No. 55 Related. Treasury Department Procedures for Preparation and Processing of Mutilated Currency.