Columbia subject headings:
Astronomical observatories--Germany--Potsdam--Exhibitions.
Einstein Tower--Exhibitions.
Potsdam (Germany)--Buildings, structures, etc.--Exhibitions.
Harvard subject headings:
Astronomical observatories--Germany--Potsdam--Design and construction--Exhibitions.
Astronomical observatories--Germany--Potsdam--Exhibitions.
Astronomical observatories--Germany--Potsdam--History.
Einstein Tower--Exhibitions.
Einstein-Turm (Potsdam, Germany)
Mendelsohn, Erich, 1887-1953.
Potsdam (Germany)--Buildings, structures, etc.--Exhibitions.
Princeton subject headings:
Astronomical observatories--Germany--Potsdam--Exhibitions.
Einstein Tower--Exhibitions.
Potsdam (Germany)--Buildings, structures, etc--Exhibitions.