Alter, Ji .̕ The system of open star clusters and our galaxy. Atlas of open star clusters. [By] G. Alter and J. Ruprecht.

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Alter, Ji .̕

The system of open star clusters and our galaxy. Atlas of open star clusters. [By] G. Alter and J. Ruprecht.

Stars -- Clusters.

Milky Way.

Ruprecht, J. (Jaroslav), joint author.

Atlas of open star clusters.