German Submarines volume 1 en 2

Lenton, H.T.: 1968 MacDonald London, hardcover with dust jacket, 126 + 128 pages, with photos and much information. These reference volumes by H. T. Lenton comprehensively detail the technical data, evolution, and construction history of the German underwater fleet during World War II. While the first part focuses on early conventional diesel-electric designs, the second part explores experimental closed-cycle engines, transport types, and uncompleted wartime projects. In good condition