File:Collier's 1921 World War - German submarine blockade.jpg

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Description
English: Map showing the locations of the German submarine war zone as of February 1, 1917, during World War I.
Date publ. 1921
Source Collier's New Encyclopedia, v. 10, 1921, p. 420.
Author publ. by P. F. Collier
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Collier%27s_1921_World_War_-_German_submarine_blockade.jpg

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current22:06, 6 February 2014Thumbnail for version as of 22:06, 6 February 2014760 × 1,116 (351 KB)Library Guy (talk | contribs){{Information |Description ={{en|1=Map showing the locations of the German submarine war zone as of February 1, 1917, during World War I.}} |Source =''Collier's New Encyclopedia'', v. 10, 1921, p. 420. |Author =publ. by P. F. Collier...

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