New railways built in Poland 1918-1939
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Background (map) from <a href="//commons.wikimedia.org/wiki/File:HistPol-admin.1.04.1938.png" title="File:HistPol-admin.1.04.1938.png">File:HistPol-admin.1.04.1938.png</a> by <a href="//commons.wikimedia.org/wiki/User:Julo" title="User:Julo">user:Julo</a>