U-Boot: Diferenzas entre revisións

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Liña 8:
* [http://www.uboat.net/ www.uboat.net/] {{en}}
* [http://ubootwaffe.net ubootwaffe.net] {{en}} {{de}}
* [http://www.gutenberg.net/etext/7947 ''The Diary of a U-boat Commander''] {{Webarchive|url=https://web.archive.org/web/20040929114045/http://www.gutenberg.net/etext/7947 |date=29 de setembro de 2004 }} – [[Proxecto Gutenberg]] (WWI) {{en}}
* [https://web.archive.org/web/20060422094445/http://www.u-boot-archiv.de/ German U-Boats 1935–1945] {{de}}
* [https://web.archive.org/web/20160303201546/http://www.third-reich-books.com/x-593-u-boat-attack.htm ''U-Boat Attack''] {{en}}