German submarine warfare 1914 - 1918 in the eyes of British Intelligence

There is an immense amount of detail about the German Submarine Warfare from 1914-1918 in this book: about the technical design of the German submarines, their officers and men, their tactics, their cruises, their victims and their opponents. This book is completely based on British sources from the National Archives, Kew, UK: Prisoner statements, Intelligence analysis, deciphered W/T, reports of sunken ships.