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Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 166
ANNALS OF THE ASTROPHYSICAL OBSERVATORY VOL. 7, PL. 8 Montezuma, Chile. Exposure racks (left) and special radiation in¬ struments (above).Infrared spectra · Solar radiation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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