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- [27] Lecture on the eclipse of the sun, June 29, 1927. PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON, 1927, 39 : 0458 - 0462
- [28] The Spectrum of the corona as observed by the expedition from the Lowell observatory at the total eclipse of June 8, 1918 ASTROPHYSICAL JOURNAL, 1922, 55 (02): : 73 - 84