Bright nebulae and star clusters in Sagittarius and Scutum
By: by John C. Duncan ...
Series: Contributions from the Mount Wilson Observatory.; no. 177
Published: 1920
Place of publication: [Chicago
Language: eng
Subjects: Nebulae.; Stars -- Clusters.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Reprinted from the Astrophysical Journal, vol. LI, no. 1, January, 1920."