Classifying the Berkeley Open Clusters

With so many subjective evaluations to be made I find it very
difficult to classify open clusters with any degree of confidence. The
degree of concentration and detachment seems particularly difficult to
judge.

http://www.martin-nicholson.info/classificationopen/openberkeley.htm

Martin Nicholson, Daventry, England.
http://www.martin-nicholson.info/1/1a.htm

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