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WikiPedia: Hermann_Oberth http://cantic.bnc.cat/registres/CUCId/a1146320x http://www.historyofinformation.com/expanded.php?i... http://www.kiosek.com/oberth/ http://www.mufon.com/MUFONNews/znews_oberth.html http://rumfart.dk/vis.asp?id=34 http://www.allstar.fiu.edu/aero/tsiolkovsky.htm http://www.centennialofflight.gov/essay/SPACEFLIGH... http://uli.nli.org.il/F/?func=direct&doc_number=00... http://data.bibliotheken.nl/id/thes/p074755889 http://www.nmspacemuseum.org/halloffame/detail.php...