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WikiPedia: Ostbahn http://forum.axishistory.com/viewtopic.php?f=66&p=... http://www.polish-railways.com/default_235.html http://www.zvab.com/displayBookDetails.do?itemId=2... http://old.pkp.pl/node/178 https://books.google.com/books?id=bsnbugaMLCcC https://books.google.com/books?id=bsnbugaMLCcC&q=R... https://books.google.com/books?id=gY_o6_7TP98C&pg=... https://books.google.com/books?id=j6VCNno2DVMC&pg=... https://books.google.com/books?id=j6VCNno2DVMC&pg=... https://web.archive.org/web/20120224030523/http://...