Rick Very many thanks for your kind, and extensive reply. I really am most grateful. The information was required for a bibliography and commentary of German books about the Great War upon which I am working. The objective is to provide a brief commentary on the book and, where possible, details of the author and his career. Hashagen was defeating me. The book is, I think, outstanding, well written and deeply considerate of the submariner's role, with none of the cloying nationalism and self justification which so many other German accounts of the war contain. Hashagen is content to let his service "do the talking".For information information there are at least 130 translated works - excluding those by the "great and the good" and they include army, navy, air service and home front accounts. So, many thanks again. If anyone can add post 1939 information it would be a bonus!