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1Published 1915Subjects: “…Wereldoorlog 1…”
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3Briefe aus Deutschland : Blätter zum Studium der wirtschaftlichen Lage in den kriegführenden LändernPublished [1916]Subjects: “…Wereldoorlog 1…”
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5Published 1917Subjects: “…Wereldoorlog 1…”
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8Published 1915Subjects: “…Wereldoorlog 1…”
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9Published 1915Subjects: “…Wereldoorlog 1…”
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12Subjects: “…Wereldoorlog 1…”
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13Subjects: “…Wereldoorlog 1…”
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17Published 1917Subjects: “…Wereldoorlog 1…”
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18Subjects: “…Wereldoorlog 1…”
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