Columbia subject headings:
Architectural drawing--Europe--Catalogs.
Architectural drawing--Italy--Catalogs.
Architecture--Italy--Milan--Catalogs.
Milan (Italy)--Buildings, structures, etc.--Catalogs.
Harvard subject headings:
Architectural drawing--Archival resources--Directories.
Architecture--Archival resources
Architecture--Italy--Milan--History--Archival resources--Directories.
Princeton subject headings:
Architectural drawing--Italy--Milan.
Architecture--Italy--Milan.