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- German U-boat Codes, 1939-1943. Barnes & Noble Books. p. 246. ISBN 978-0-7607-0863-7. David Kahn, Page 201 Faulkner, Marcus (1 August 2010). "The Kriegsmarine...13 KB (1,579 words) - 07:36, 1 April 2024
to Break the German U-boat Codes, 1939–1943. Barnes & Noble. ISBN 978-0-7607-0863-7. Pringle, Geoff (December 2003). "518 Squadron and the Key to the...11 KB (1,333 words) - 14:07, 23 August 2024
U-boat codes, 1939–1943. Barnes & Noble Publishing. pp. 149–152. ISBN 978-0-7607-0863-7. United States Weather Bureau (February 1949). "AWP Headquarters Moves...31 KB (3,627 words) - 22:37, 19 August 2024
