Preliminary evidence of internal motion in the spiral nebula Messier 101
By: photographs by G.W. Ritchey, J.E. Keeler, C.D. Perrine, and H.D. Curtis, measured and discussed by A. van Maanen ...
Series: Contributions from the Mount Wilson Solar Observatory.; no. 118
Published: 1916
Place of publication: [Chicago
Language: eng
Number of pages: 19
Subjects: Nebulae.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Preprinted from the Astrophysical Journal, vol. XLIV, 1916."