SS Gairsoppa (English Wikipedia)

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"Objects from the SS Gairsoppa". The Postal Museum. Retrieved 8 January 2024.
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Helgason, Guðmundur. "Gairsoppa". Ships hit by U-boats. Retrieved 8 April 2012.
Helgason, Guðmundur. "Gairsoppa". Crew lists from ships hit by U-boats. Retrieved 7 January 2024.