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On October 15th, 1918, Maria, a Greek sailing vessel of 43 tons, was sunk by the German submarine UC-23 (Hans Georg Lübbe) in the Gulf of Salonica, Aegean Sea (Greece).
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References
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Sailing vessel Maria – Ships hit by U-boats – German and Austrian U-boats of World War One – Kaiserliche Marine – uboat.net [WWW Document], n.d. URL https://uboat.net/wwi/ships_hit/7123.html (accessed 21.10.21).
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WRECKSITE – MARIA 1918 [WWW Document], n.d. URL https://wrecksite.eu/wreck.aspx?175900 (accessed 21.10.21).