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© 1917 by The Regents of the University of California
Hardships of the U-Boat Service: Captain L. Persius, Leading German Naval Critic, Praises the Men Who Torpedo Merchant Ships. Current History 1 July 1917; 6_Part-2 (1): 90–92. doi: https://doi.org/10.1525/curh.1917.6P2.1.90
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