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'The variable sun', Harpers

Tags: 1910s; 1914; 1914-7-1; Abbot, C. G. (Charles Greeley); Astrophysics; Bolometer; C.G. (Charles Greeley) Abbot; Cosmology; D.C.); Effect of solar radiation on; Mount Wilson Observatory (Calif.); Observations; Physics; Plants; Research; S.P. (Samuel Pierpont) Langley; Smithsonian Astrophysical Observatory (Washington; Sun