Image: German Submarine War Zone Announced 1 February 1917

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Description: Map showing unlimited submarine warfare zone announced by Germany on 1 February 1917.
Title: German Submarine War Zone Announced 1 February 1917
Credit: "The Sory of the Great War" Volume VI. Edited by Francis J Reynolds, Allen C Churchill, Francis Trevelyan Miller. Publised by John A Collier & Son Company, New York, 1920. Downloaded from https://archive.org/details/storyofgreatwarh06churuoft
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License: Public domain
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