Seizing the enigma: the race to break the German U-boat codes, 1939-1943/ David Kahn.

"A Thomas Congdon book"--T.p. verso.

Main Author: Kahn, David 1930-
Format: Online
Published: Boston: Houghton Mifflin Co., 1991
Online Access: https://consultaredebie.decex.eb.mil.br/pergamum/biblioteca/index.php?codAcervo=407108
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