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Dear Mr. Pomfret,
Thank you for posting your request on History Hub!
The most recent records from the Department of State are the Central Foreign Policy Files, created, 7/1/1973 - 12/31/1979 that are available using Access to Archival Databases (AAD). For records dating after 1979, please submit a Freedom of Information Act Request directly to the Department of State.
Some NSC (and possibly Department of State) records may be available at relevant Presidential Libraries. For more information, please see https://www.archives.gov/presidential-libraries.
We hope this is helpful. Best of luck with your research!