Bremer Vulkan was a German shipbuilding company, located in
Bremen-Vegesack. and was founded in 1893, Ships and U-boats
built by Bremer Vulkan 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