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Submarines and Submarine Warfare | International Encyclopedia of the
10 Facts About Submarine Warfare in World War One | History Hit
Submarine Detection Helped U.S. Track Enemy During WWI - Connecticut in
The Submerged History of the Submarine - JSTOR Daily
World War One: How tanks made tracks for future Army - BBC News
By Sea - World War One - LibGuides at High Point University
This Week in World War I, February 13-19, 1916 | HuffPost