[Article] Studies of Magnitude in Star Clusters XII. Summary of a Photometric Investigation

The Spectrum of Cephei

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Studies of the Magnitudes in Star Clusters IV. On the Color of Stars in the Galactic Clouds Surrounding Messier II

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Studies of the galactic center. IV. On the transperancy of the galactic star clouds

1929 · PDF

Studies of the Galactic Center III. The Absolute Magnitudes of Long Period Variables

1928 · PDF

Studies of the Galactic Center II. Preliminary Indication of a Massive Galactic Nucleus

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Studies of the Galactic Center I. The Program for Milky Way Variable Stars

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Studies of Magnitudes, in Star Clusters XI. Frequency of Curves the Absolute Magnitude and Color Index for 1152 Giant Stars

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Studies of Magnitudes in Star Clusters XIII. Variable Stars in N. G. C. 7006

1921 · PDF