New General Catalogue: Perbedaan antara revisi
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Baris 172:
* {{en}} [http://www.seds.org/~spider/ngc/ngc.html The Interactive NGC Catalog] {{Webarchive|url=https://web.archive.org/web/20061101001105/http://www.seds.org/~spider/ngc/ngc.html |date=2006-11-01 }}, SEDS
* {{en}} [http://www.licha.de/astro_gallery_ngc.php The Amateur Photographic NGC Catalog] {{Webarchive|url=https://web.archive.org/web/20110514124324/http://www.licha.de/astro_gallery_ngc.php |date=2011-05-14 }}
* {{en}} [http://www.ngcicproject.org/ The NGC/IC Project] {{Webarchive|url=https://web.archive.org/web/20100227154623/http://www.ngcicproject.org/ |date=2010-02-27 }}
* {{en}} [http://astronomy-mall.com/Adventures.In.Deep.Space Adventures in Deep Space: Challenging Observing Projects for Amateur Astronomers.]
* {{en}} [http://cdsarc.u-strasbg.fr/viz-bin/VizieR?-meta.foot&-source=VII/1B Revised New General Catalogue]
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