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On June 19th, 1917, Maria, a Greek sailing vessel of 35 tons, was sunk by the German submarine UC-23 (Johannes Kirchner) in the northern part of the Aegean Sea.
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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/7121.html (accessed 29.5.21).
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WRECKSITE – MARIA 1917 [WWW Document], n.d. URL https://wrecksite.eu/wreck.aspx?175899 (accessed 29.5.21).