Preussische Akademie der Wissenschaften. Physikalisch-Mathematische Klasse.
Published versions of the history of the fixed star galaxy, 1897-1945.
Administrative and working papers; and letters from the unusual scientific project supported by the Mathematical Physics Department of the Academy, i.e., "Geschichte des Fixsternhimmels."
Geschichte des fixsternhimmels.
Galaxies -- History.
Stars -- Research.
Learned institutions and societies -- Germany.
Mathematical physics -- Research.
Stars -- Research.
AIP-ICOS
Archiv der Berlin-Brandenburgische Akademie der Wissenschaften. JgĖerstrasse 22/23, 10117 Berlin