http://dewey.info/scheme/edition/e23/ en
940.42 Land campaigns and battles of 1914-1916
940.421 1914, western front
http://dewey.info/scheme/edition/e22/ de
940.42 Feldzüge und Schlachten als Landoperationen von 1914–1916
940.421 1914, Westfront
Dewey Decimal Classification
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