Some of my favorite reference books from my collection:
Anatomy of the Ship: The Type VII Uboat
Encyclopedia of UBoats From 1904 to the Present
Uboat War Patrol: The Hidden Photograhic Diary of U-564
Warship Pictoral #27: Kriegsmarine Type VII Unterseeboot
U-Boot - The History of the Kriegsmarine U-Boats 1935-1945
...but Silversurfer was right - Das Boot and Iron Coffins are both excellent reads in their own rights!
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