The source of luminosity in galactic nebulae
By: by Edwin Hubble ...
Series: Contributions from the Mount Wilson Observatory.; no. 250
Published: 1922
Place of publication: [Chicago
Language: eng
Number of pages: 39
Subjects: Nebulae.; Stars -- Magnitudes.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Reprinted from the Astrophysical Journal, vol. LVI, 1922."