Publications of the Astronomical Society of the Pacific · 1971 · 106 citations · 0 references
Natural SciencesAstronomyPhysicsAstrophysicsGalaxy ClustersStar ClustersGalaxy ClassificationGalaxy Cluster DistancesGalaxy GroupsGalaxy Population In Clusters
Preliminary types are listed for the 111 Abell clusters with distance classes less than four. Key words: clusters of galaxies - galaxies