31 C.F.R. § 1.29
(b) Records transferred to the National Archives of the United States—(1) Records transferred to National Archives prior to September 27, 1975. Records pertaining to an identifiable individual transferred to the National Archives prior to September 27, 1975, as a record which has sufficient historical or other value to warrant its continued preservation by the United States Government, are deemed records maintained by the National Archives, and:
(2) Records transferred to National Archives on or after September 27, 1975. Records pertaining to an identifiable individual transferred to the National Archives as a record which has sufficient historical or other value to warrant its continued preservation by the United States Government, on or after September 27, 1975, must be deemed records maintained by the National Archives, and: