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SM UC-42 - Wikipedia
UB 42 - German and Austrian U-boats of World War One
List of most successful German U-boats - Wikipedia
List of U-boat types - Wikipedia
How German U‑Boats Were Used in WWI—And Perfected in WWII
UC 42 - Wreck of WW1 German U-boat - YouTube
7. Selected technical data - The U-boat War in World War One …
The Type IX U-boat U-42 - German U-boats of WWII - uboat.net
Steel predators: The silent threat of German U-boats in WWI
U-boat | German Submarine Warfare in WWI & WWII | Britannica