Rosenberg, Hans, 1873-1967, author. On the relation between brightness and spectral type in the Pleiades / by Hans Rosenberg, translated by Jan Hollan.

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Rosenberg, Hans, 1873-1967, author.

On the relation between brightness and spectral type in the Pleiades / by Hans Rosenberg, translated by Jan Hollan.

HR diagrams.

Hollan, Jan