The Air Force’s “Reports on Soviet Air Power and Strategic Nuclear Weapons,” about 2,500 pages in all, were produced between 1952 and 1955 — but not until earlier this year were 2,210 pages made public.

The release is part of a massive effort at the National Archives and Records Administration to clear a backlog of nearly 400 million pages of material that should have been declassified a long time ago.

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