History for All: British Intelligence at Your Fingertip Online Database by Gale, a Cengage Company : Declassified Documents of Twentieth-Century British Intelligence: An Intelligence Empire . Database contains about 500,000 pages from 1905–2002. https://www.gale.com/c/declassified-documents-online-twentieth-century-british-intelligence-intelligence-empire . Cost: About $5,000.
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