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Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)
Washington : Government printing office · leaf 197
PLATE XXI B. BOLOGRAPHS OF THE INFRA-RED SOLAR SPECTRUM OF A 60° GLASS PRISM. A9TROPNY9ICAL OBSERVATORY ANNALS, VOLUME I.Infrared spectra · Solar radiation
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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