Stein, Dr. J., "β Lyrae as a Double Star" from the Proceedings of the Meeting of Saturday November 30, Royal Academy of Sciences, Amsterdam,, 1907

Stein, Dr. J., "β Lyrae as a Double Star" from the Proceedings of the Meeting of Saturday November 30, Royal Academy of Sciences, Amsterdam,, 1907. Georgetown Observatory Collection, GRB-000010. Georgetown University Rare Books , Booth Family Center for Special Collections. https://findingaids.library.georgetown.edu/repositories/14/archival_objects/1163577 Accessed March 13, 2026.