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SM U-20 (Germany) - Wikipedia
U 20 - German and Austrian U-boats of World War One
U-20-class submarine - Wikipedia
SM U-20 - The Lusitania Resource
The Type IIB U-boat U-20 - German U-boats of WWII - uboat.net
SM U-20 - German Boat That Sinked the British RMS Lusitania …
First World War.com - Encyclopedia - U-20 and the Lusitania
Type U 20 - Deutsches U-Boot-Museum - dubm.de
Ships hit by U-20 - U-boat Successes - German U-boats - uboat…
How German U‑Boats Were Used in WWI—And Perfected in WWII
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