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Globular Clusters
M15, Omega Centauri, A Galactic Globular Clusters Database, Catalogue of Milky Way Globular Cluster Parameter, Catalogue of Variable Stars in Globular Clusters, Databases of Padova Astronomy Department, Globular Star Clusters, The Globular Cluster Group at Leeds University
Open Clusters
Catalog of Bright Open Clusters, Catalogue of Open Cluster Data (5th Ed.), WEBDA
Lacaille and his catalog of clusters and nebulae
A discussion of Lacaille's catalog, which is mainly of historical interest. Includes the catalog itself.
Star Clusters
General information on star clusters from SEDS.
Stellar Clusters
Lecture notes by Professor Barbara Ryden.