Columbia subject headings:
Architects--Germany--Biography.
Architecture, German--20th century.
Architecture--Germany--History--20th century.
Ruf, Sep, 1908-1982--Catalogs.
Ruf, Sep, 1908-1982--Criticism and interpretation.
Ruf, Sep, 1908-1982.
Harvard subject headings:
Architects--Germany--20th century--Biography.
Architecture, German--20th century.
Architecture--Germany--History--20th century
Ruf, Sep, 1908-1982--Catalogs.
Ruf, Sep, 1908-1982--Criticism and interpretation.
Ruf, Sep, 1908-1982.
Princeton subject headings:
Architects--Germany--20th century--Biography.
Architecture, German--20th century.
Architecture--Germany--History--20th century.
Catalogs.
Ruf, Sep, 1908-1982--Catalogs.
Ruf, Sep, 1908-1982--Criticism and interpretation.
Ruf, Sep, 1908-1982.