Astronomische Beobachtungen auf der Sternwarte der Königlichen rheinischen Friedrich-Wilhelms-Universität zu Bonn
Book digitized by Google from the library of the New York Public Library and uploaded to the Internet Archive by user tpb. Vol. 1-6, 8 have also special t.p Vol. 1-7: Angestellt und hrsg. von Friedrich Wilhelm August Argelander, director Vol. 8: Angestellt und hrsg. von Eduard Schönfeld, director Vol. 1 wanting
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