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Category : World War I submarines of the United States
WW1 American Submarines - Naval Encyclopedia
United States L-class submarine - Wikipedia
WWI: Submarines - NHHC
Submarines in the United States Navy - Wikipedia
Submarine Warfare in WW1 - World War 1 Veterans, WWVets.org
O class submarines (1917) - Naval Encyclopedia
Submarine Force - NHHC
Warfare Under the Waves – Submarines in the First World War