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- 34-39 Neutrality Patrol Panama Conference (1939) Gannon, Michael (1991). Operation Drumbeat. New York: Harper Collins. pp. 82–83. ISBN 0-06-092088-2....3 KB (361 words) - 10:09, 2 January 2024
- Michael (1991). Operation Drumbeat. New York: Harper Collins. ISBN 0-06-092088-2. Kahn, David (1996). The Codebreakers. ISBN 978-0-684-83130-5. Montagu...8 KB (747 words) - 22:36, 31 December 2023
- Michael (1990). Operation Drumbeat. Harper. pp. 388–389 & 414–415. ISBN 0-06-092088-2. Michael Salvarezza; Christopher Weaver, On Final Attack, The Story...61 KB (7,362 words) - 22:15, 18 April 2024