On the collaboration between the observatories of Johannesburg and Leiden concerning photographic measures of double stars
By: Ejnar Hertzsprung
Publisher: Koninklijke akademie van wetenschappen
Published: 1933
Place of publication: Amsterdam
Language: eng
Subjects: Double stars; Measurement; Astronomical photography
Notes: Cover title.

"Reprinted from: Proceedings Vol. XXXVI, nos. 8, 1933".