WILLIAMSON Gordon U-boat bases and bunkers 1941-45 - Oxford UK: Osprey, 2003 - 64p. - Fortress 3 . Illustrated guide to the massive bases and bunkers built for Germany's U-boat fleets in France, Norway and Germany. Describes the design, construction and use of these bases during the Second world War. ISBN: 1841765562 (pbk.): 16.95 USD Subjects--Topical Terms: FORTIFICATIONSSUBMARINE BASESU BOAT BASES