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These Fake Trees Were Used as Spy Posts on the Front Lines of World War I | Travel| Smithsonian Magazine
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Goofy vintage photos of World War One soldiers posing with fake military props, 1914-1930 - Rare Historical Photos
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The Army's special branch: How bizarre fake spy trees appeared in no-man's land during WWI | Daily Mail Online
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The Army's special branch: How bizarre fake spy trees appeared in no-man's land during WWI | Daily Mail Online
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