Columbia subject headings:
Architecture--France--History--20th century.
Perret, Auguste, 1874-1954--Archives.
Perret, Gustave, 1876-1952--Archives.
Harvard subject headings:
Architecture--France--History--20th century--Catalogs
Architecture--France--History--20th century--Sources--Catalogs.
Buildings, Reinforced concrete--France--History--Catalogs.
Buildings, Reinforced concrete--France--History--Sources--Catalogs.
Institut français d'architecture--Archives--Catalogs.
Institut français d'architecture--Catalogs.
Perret, Auguste, 1874-1954--Archives--Catalogs.
Perret, Auguste, 1874-1954--Catalogs.
Perret, Gustave, 1876-1952--Archives--Catalogs.
Perret, Gustave, 1876-1952--Catalogs.
Princeton subject headings:
Architecture, Modern--20th century--France--Sources--Catalogs.
Buildings, Reinforced concrete--France--Sources--Catalogs.
Catalogs.
Institut français d'architecture--Archives--Catalogs.
Perret, Auguste, 1874-1954--Archives--Catalogs.
Perret, Gustave, 1876-1952--Archives--Catalogs.