Spectral energy-curve of sun-spots
By: by Edison Pettit and Seth B. Nicholson ...
Contributors: Nicholson, Seth Barnes, 1891- joint author.
Series: Contributions from the Mount Wilson Observatory.; no. 397
Published: 1930
Place of publication: [Chicago
Language: eng
Number of pages: 10
Subjects: Sunspots.; Spectrum, Solar.
Notes: Cover-title.
At head of title: Carnegie Institution of Washington.
"Reprinted from the Astrophysical Journal, vol. LXXI, 1930."