First and second report on the progress of the plan of selected areas
By: by J.C. Kapteyn... Pub. by the Astronomical laboratory at Groningen.
Contributors: Rijksuniversiteit te Groningen. Sterrekundig laboratorium.
Publisher: Hoitsema brothers
Published: 1911
Place of publication: Groningen
Language: eng
Number of pages: 34
Subjects: Stars -- Observations.