The book series “Das Echolot” by the writer Walter Kempowski consists of four parts and ten individual volumes. It presents an uncommented collage of letters, diaries, autobiographical memoirs, and photographs from the World War II era.
Walter Kempowski 1993-2005: Das Echolot. A collective diary. Munich: Knaus
If you don’t have a bookstore worth supporting near you, you can also buy the book from the alternative non-profit online bookstore links-lesen.de, which supports political projects with the profits. The link can be found here.