Internal motions of Messier 33
By: by Knut Lundmark ...
Series: Contributions from the Mount Wilson Observatory.; no. 308
Published: 1926
Place of publication: [Chicago
Language: eng
Subjects: Stars -- Proper motion.; Nebulae.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Reprinted from the Astrophysical Journal, vol. LXIII, 1926."