Columbia subject headings:
Hilmer & Sattler und Albrecht.
Ortner & Ortner.
Steidle + Partner.
Harvard subject headings:
Architectural firms--Germany--Berlin.
Architecture--Germany--Berlin--20th century.
Architecture--Germany--Berlin--History.
Berlin (Germany)--Buildings, structures, etc.
Hilmer & Sattler und Albrecht.
Ortner & Ortner.
Steidle + Partner.
Princeton subject headings:
Architecture--Germany--Berlin--History--20th century.
Berlin (Germany)--Buildings, structures, etc.
Hilmer & Sattler und Albrecht.
Ortner & Ortner.
Steidle + Partner.