Was jeder vom deutschen U-Boot wissen muß

By Bartsch, Max
(What everyone should know about the German U-Boat)
1940, Limpert-Verlag Berlin
40 pages, 5 b&w photos, 3 drawings
book is in German language

Descripton: The author, a Korvettenkapitän (Ing.), wrote a short summary of the topic in simple words for a wartime audience.