Suggested Subjects within your search.
Suggested Subjects within your search.
Baltimore Sabotage Cell
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Deutschland (Submarine)
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Espionage, German -- United States -- History -- 20th century
United States Bureau of Investigation -- History
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World War, 1914-1918 -- Naval operations -- Submarine
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World War, 1914-1918 -- Naval operations, German
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World War, 1914-1918 -- Secret service -- Germany
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