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

Washington : Government printing office · leaf 101

An illustration from Annals of the Astrophysical Observatory of the Smithsonian Institution, 1900, leaf 101 — Plate XIII. Annals Astrophysical Observatory, Volume II ♦ Shutter Interposed to Indicate Zero of Ordinates

Infrared spectra · Solar radiation

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

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