OPA28 Soft cover booklet, Was jeder vom deutschen U-BOOT wissen müss

Soft cover booklet, Was jeder vom deutschen U-BOOT wissen müss, written by Korvettenkapitän (Ing.) Max Bartsch, 40 pages, with photos, sketches and foldout color cover with diagram and legend, published 1940, cover measures 20x13cm closed, with age but complete, USD $70 SOLD