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WikiPedia: NGC_511 http://www.astronomy-mall.com/Adventures.In.Deep.S... http://cseligman.com/text/atlas/ngc5.htm#511 http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC... http://spider.seds.org/ngc/revngcic.cgi?NGC511 http://server1.wikisky.org/starview?object=NGC+511 http://www.wikisky.org/?object=NGC+511 http://www.wikisky.org/?object=NGC+511&img_source=... http://www.wikisky.org/?object=NGC+511&img_source=... http://www.wikisky.org/?object=NGC+511&img_source=...