The Memoirs of Karl Doenitz Ten Year and Twenty Days (PDF) (Print)

This is the story of the last world war, as told by Grand Admiral Karl Dšenitz himself. His memoir covers his early career with submarines in the First World War and follows both his successes and failures through the Second World War, with great detail on the way the U-boat campaign was waged, as told by the man who invented U-boat tactics.