Sternwarte Babelsberg (Germany).
Babelsberg Observatory records, 1825-1946.
Administrative and working files.
Astronomical observatories -- Administration -- Germany.
Astronomical observatories -- Germany -- Documentation.
AIP-ICOS
Archiv der Berlin-Brandenburgische Akademie der Wissenschaften. JgĖerstrasse 22/23, 10117 Berlin