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German U-boat bases in occupied Norway - Wikipedia
Submarine pen - Wikipedia
Dora I - Wikipedia
U-boat base Bruno Bergen - battlefieldsww2.com
U-boat base Dora Trondheim - battlefieldsww2.com
The Most Famous Bergen World War II Sites - The Hidden North
uboat.net - Boats - Flotillas - Bases - Trondheim, Norway
The 'Bloody 100th' Bomb Group - The National WWII Museum
U-boat Base La Pallice - battlefieldsww2.com
uboat.net - Boats - Flotillas - Bases
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