Zoellner, Karl Friedrich, - , German astrophysicist, works, astro-photometer on a refracting telescope, Leipzig observatory, wood engraving, 19th century,

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Keywords: astro, astro-photometer, astronomy, astrophysicist, astrophysics, friedrich, german, historic, historical, karl, photometer, physical, physics, refractor, science, scientist, works, zoellner, zollner, öllner