Deep Sky
Arp’s Catalog Of Peculiar Galaxies – Catalog by Dr. Halton C. Arp
Classification and Morphology of External Galaxies – By G. De Vaucouleurs
Herschel 400 (NGC/IC Project) – Photos in NCG designation order
SDSS Images of Selected RC3 Galaxies – Hogg raw SDSS data at NYU and Princeton
UGC – Uppsala General Catalog of Galaxies – Referrenced from The Uppsala General Catalogue of Galaxies (UGC), Nilson P. 1973, Uppsala Astron. Obs. Ann. 6. on NASA’s site
UGC – Table to Search Catalogs – HEASARC, NASA’s site
William Herschel’s Deep Sky Catalog
