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WikiPedia: Linke-Hofmann R.II http://www.flightglobal.com/pdfarchive/view/1919/1... http://wroclaw.hydral.com.pl/110884,foto.html http://www.airwar.ru/enc/bww1/linker2.html https://archive.org/details/germangiantsgerm00hadd https://archive.org/details/germangiantsgerm00hadd... https://web.archive.org/web/20120215003347/http://...