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Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 214
192 ANNALS OF THE ASTROPHYSICAL OBSERVATORY 1920 1925 1930 1935 … Fig. 15. — 34-, 54-, and 11.87-month periodicities.Infrared spectra · Solar radiation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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