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U-BOOT
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Die deutschen U-Boote und ihre Werften : e. Bilddokumentation über d. dt. U-Bootbau in 2 Bd.
The first submarine boat. From "La the Netherlands
Submarine boats -- From the earliest records down to the present
The submarine boat; its promises and performances
Submarine torpedo-boats -- Past, present and future
Construction and operation of the submarine boat "Argonaut"