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© 1917 by The Regents of the University of California
Charles H. Grasty; Submarine Sinkings in Eight Months: Total Ship Tonnage of 4,561,000 Sunk Since the Beginning of Germany’s Intensified U-Boat Campaign. Current History 1 October 1917; 7_Part-1 (1): 137–138. doi: https://doi.org/10.1525/curh.1917.7P1.1.137
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