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Annals of the Astrophysical Observatory of the Smithsonian Institution (1900)

Washington : Government printing office · leaf 313

An illustration from Annals of the Astrophysical Observatory of the Smithsonian Institution, 1900, leaf 313
275 ANNALS OF THE ASTROPHYSICAL OBSERVATORY

Infrared spectra · Solar radiation

Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.

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