A study of the light-curve of XX Cygni
By: by Harlow Shapley and Martha Betz Shapley ...
Contributors: Shapley, Martha Betz, joint author.
Series: Contributions from the Mount Wilson Solar Observatory.; no. 104
Published: 1915
Place of publication: [Chicago
Language: eng
Number of pages: 15
Subjects: Variable stars.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Reprinted from the Astrophysical Journal, vol. XLII, 1915."