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© 1918 by the Regents of the University of California
1918
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Secretary Daniel; The North Sea Submarine Barrage: How Our Navy Helped to Defeat the U-Boat, with the Greatest Mine Area on Record. Current History 1 December 1918; 9_Part-1 (3): 489–491. doi: https://doi.org/10.1525/curh.1918.9P1.3.489
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