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| intelligence production (Edbrook C.D. Principles of deep cover // Studies in Intelligence. – Vol. 5. – Issue: Summer. – CIA, 1961. – pp. 1 – 29, declassified in 1995 financial-engineer) | |||
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| intelligence production (Edbrook C.D. Principles of deep cover // Studies in Intelligence. – Vol. 5. – Issue: Summer. – CIA, 1961. – pp. 1 – 29, declassified in 1995 financial-engineer) | |||