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List of submarine classes of the United States Navy - Wikipedia
The Barbel Class: The U.S. Navy's Last Diesel Attack Submarines
Barbel-class submarine - Wikipedia
Do Diesel Submarines Have a Future in the U.S. Navy?
The U.S. Navy Needs Diesel-Electric Submarines Now
There's a Case for Diesels | Proceedings - June 2018 144/6/1,384
USS Dolphin (AGSS-555) Submarine - Diesel Power Magazine - MotorTrend
US Sub Squadron, Peruvian Sub Join in Diesel-Electric Initiative
HSM Wing Pacific Begins Phase Two of Diesel Electric Submarine ...
The Navy Just Received Its First Big Robo-Sub, the ‘Orca’