Posted in Astronomy Resources Tags: Arp, caldwell, catalogs, collinder, double stars, galaxies, Herschel, IIC, LDN, logbooks, Lund, Lynds, Messier, messier marathon, Minkowski, NGC, Perek-Kohoutek, PK, planetary nebulae, Sh, Sharpless, UGC, Uppsala
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PCW Memorial Observatory - Erika Rix 