31 C.F.R. § 2.19 Assistance to the Department of State [3.3(b)].
Title 31 - Money and Finance: Treasury
The Secretary of the Treasury shall assist the Department of State in its preparation of the “Foreign Relations of the United States” series by facilitating access to appropriate classified material in Treasury custody and by expediting declassification review of documents proposed for inclusion in the series.
Title 31: Money and Finance: Treasury
PART 2—NATIONAL SECURITY INFORMATION
Subpart C—Downgrading and Declassification
§ 2.19 Assistance to the Department of State [3.3(b)].

