PK	1500		Perek and Kohoutek, 1967 , Praag. "Catalogue of Galactic Planetary Nebulae". Bevat alle planetaire nevels die gekend waren in 1964.
PNG			'Strasbourg-ESO Catalogue of Galactic Planetary Nebulae' (ESO)
Abell			G.O.Abell, 1966. Planetaire nevels, ontdekt op de "National Geographic Society-Palomar Observatory Sky Survey.