events, First World War/WWI, documents, Germany, War Diary of submarine UC-20, - , imperial navy, administration, military, 20th century, ,

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Photo credit: © INTERFOTO / History / Alamy / Afripics
License: Licensed
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Keywords: 1900s, 1910s, 20, diary, documents, events, germany, historic, historical, uc, uc20, war, world, wwi