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* secrets and spies *
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* Letter from Denys Page, deputy head of the Government Code and Cypher School, to John Cecil Masterman, architect of the double-cross system, 26 May 1944 *
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* (Catalogue reference: KV 2/466) *
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Catalogue reference: KV 2/466; letter to Masterman, architect of the double-cross system, 1944
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