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WikiPedia: Schwerer Gustav http://www.aopt91.dsl.pipex.com/railgun/Content/Ra... http://members.tripod.com/~fingolfen/superheavy/p1... http://www.hpwt.de/2Weltkrieg/Dorae.htm http://html2.free.fr/canons/dora.htm https://web.archive.org/web/20010605030600/http://... https://web.archive.org/web/20010605062735/http://... https://web.archive.org/web/20080221165857/http://... https://commons.wikimedia.org/wiki/Category:80_cm_...