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WikiPedia: Sea Dragon https://web.archive.org/web/20161025063452/http://... https://web.archive.org/web/20160728041625/http://... https://web.archive.org/web/20160728025837/http://... https://web.archive.org/web/20050206233144/http://... https://web.archive.org/web/19990220012929/http://... https://web.archive.org/web/20051226092121/http://... https://web.archive.org/web/20051226101113/http://... http://www.popularmechanics.com/space/rockets/a259... http://www.citizensinspace.org/2013/01/historical-... https://www.bls.gov/data/inflation_calculator.htm