Star Clusters Save
General information on star clusters from SEDS.
http://www.seds.org/messier/cluster.html   

Lacaille's Catalog of Nebulae of the Southern Sky Save
A discussion of Lacaille's catalog, which is mainly of historical interest. Includes the catalog itself.
http://www.seds.org/messier/xtra/hist...   

Stellar Clusters Save
Lecture notes by Professor Barbara Ryden.
http://www-astronomy.mps.ohio-state.e...   

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