Schiffbau Gesellschaft Unterweser AG was a German shipbuilding
company, located in Bremerhaven, Ships and U-boats built by
Schiffbau Gesellschaft Unterweser AG include.
German Warships, 1815-1945: Major Surface Vessels.
German Warships, 1815-1945: U-boats and Mine Warfare Vessels.
German warships of the Second World War.
For a complete list of sources