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WikiPedia: Carl_Sagan http://ejournals.library.vanderbilt.edu/ameriquest... http://lccn.loc.gov/2006044827 http://lccn.loc.gov/64018404 http://lccn.loc.gov/66022436 http://lccn.loc.gov/72004572 http://lccn.loc.gov/72009746 http://lccn.loc.gov/73013999 http://lccn.loc.gov/73081117 http://lccn.loc.gov/76053472 http://lccn.loc.gov/77005991