Okrety podwodne Sokól i Dzik

By Pertek, Jerzy
(Polish Submarines: Sokol and Dzik)
1958, Wydawnictwo Morskie Gdynia
Paperback, 32 pages, many photos (blurry), diagrams (incl. Jolly Rogers for both boats)
book is in Polish language

Descripton: Story of the Terrible Twins, the two U-Class British-built Polish subs operating in the Mediterranean, with crew narratives. Covers 1941-45.

Historia "strasznych blizniaków" ze zdjeciami i fragmentami narracji autorstwa czlonków zalogi.