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WikiPedia: NGC_2175 http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC... http://simbad.u-strasbg.fr/simbad/sim-id?Ident=ngc... http://www.ngcicproject.org/pubdb.htm http://messier.seds.org/xtra/ngc/n2175.html https://web.archive.org/web/20090528100240/http://...