General information on star clusters from SEDS.
http://www.seds.org/messier/cluster.html
| Catalog of Bright Open Clusters |
from ARVAL observatory.
http://www.oarval.org/OClust.htm
Information, photos, links, and finder charts. The site owner's astrophotos and sketches, too.
http://www.geocities.com/natkobajic/
A large image and a discussion of M15 as a candidate for an example of core collapse.
http://www.astr.ua.edu/gifimages/m15r.html
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